Western Fence Lizard (Sceloporus occidentalis) Care Sheet
The Western Fence Lizard (Sceloporus occidentalis) is a highly active, strongly diurnal lizard native to western North America. It is commonly seen basking on fences, fallen logs, rocks, tree trunks and walls, giving rise to its familiar common name.
Adult males are particularly recognisable for their vivid blue abdominal and throat markings, which have also earned the species the informal name:
“blue-belly.”
Although relatively small, Western Fence Lizards should not be kept in undersized or sparsely furnished enclosures. They are fast, territorial, visually oriented animals that make extensive use of both the ground and elevated structures.
Good husbandry should provide:
- Generous floor space
- Substantial climbing opportunities
- Extremely bright daytime illumination
- Appropriate UVB
- Broad overhead basking heat
- A strong thermal gradient
- Dry-to-moderate general humidity
- More humid sheltered microclimates
- Natural soil substrate
- A varied live-invertebrate diet
- Seasonal temperature variation
- Minimal forced handling
- Secure housing
Documented captive-bred animals should be preferred over wild-collected individuals.
Quick facts
Scientific name: Sceloporus occidentalis
Common names: Western Fence Lizard, Pacific Blue-Bellied Lizard, Blue-Belly
Family: Phrynosomatidae
Distribution: Western United States and northern Baja California, Mexico
Lifestyle: Terrestrial to scansorial
Activity: Diurnal
Adult size: Usually approximately 15–22 cm (6–8½ in) total length, depending on sex and population
Snout-to-vent length: Commonly approximately 5–9 cm (2–3½ in)
Lifespan: Approximately 5–8+ years in suitable captive conditions, potentially longer
Diet: Primarily insectivorous
Day ambient temperature: Approximately 24–29°C (75–84°F)
Warm zone: Approximately 28–31°C (82–88°F)
Basking surface: Approximately 35–40°C (95–104°F)
Cool area: Approximately 21–24°C (70–75°F)
Night temperature: Approximately 15–21°C (59–70°F), with locality-dependent variation
General humidity: Approximately 35–55%, with more humid sheltered microclimates
UVB: Strongly recommended and an important part of high-quality long-term husbandry
Suggested basking UVI: Approximately 3–5
Adult enclosure: At least approximately 90 × 45 × 60 cm (3 × 1½ × 2 ft) for one adult; 120 × 60 × 60 cm (4 × 2 × 2 ft) or larger strongly preferred
Housing: Individual housing safest, especially for adult males
Reproduction: Egg-laying
Handling: Minimal
Experience level: Beginner-to-intermediate husbandry once legally sourced, although seasonal breeding requires greater experience
Taxonomy
The accepted scientific name is:
Sceloporus occidentalis
It belongs to:
Family: Phrynosomatidae
Genus: Sceloporus
The species was described by Baird and Girard in 1852.
Recognised subspecies
Current taxonomic references commonly recognise several geographic forms, including:
- Sceloporus occidentalis occidentalis
- Sceloporus occidentalis biseriatus
- Sceloporus occidentalis bocourtii
- Sceloporus occidentalis longipes
- Sceloporus occidentalis taylori
Different subspecies occupy substantially different:
- Elevations
- Climatic zones
- Winter conditions
- Habitats
Known locality should therefore be retained whenever captive animals have reliable provenance.
Island Fence Lizard
The Island Fence Lizard historically treated as:
Sceloporus occidentalis becki
is now generally recognised as the separate species:
Sceloporus becki**.**
It should not automatically be treated as simply another Western Fence Lizard locality.
Natural distribution
The Western Fence Lizard occurs through much of western North America.
Its range includes portions of:
- Washington
- Oregon
- California
- Nevada
- Idaho
- Utah
and extends into:
northern Baja California, Mexico.
Geographic variation
The species occupies an enormous range of environmental conditions.
Populations may occur in:
- Coastal areas
- Dry inland valleys
- Oak woodland
- Coniferous forest
- Chaparral
- Grassland
- Desert margins
- Mountain habitats
Consequently, there is no single natural climate that perfectly represents every population.
Locality matters
A Western Fence Lizard from:
coastal northern California
may naturally experience very different humidity and temperature cycles from one originating in:
inland Nevada or southern California.
Captive seasonal management should therefore take known geographic origin into account.
Natural habitat
Typical habitats contain a mixture of:
- Open sunny basking sites
- Rocks
- Fallen timber
- Fences
- Tree trunks
- Shrubs
- Ground vegetation
- Crevices
- Leaf litter
Human-modified habitats
Western Fence Lizards adapt readily to environments containing:
- Garden walls
- Fences
- Wood piles
- Buildings
- Trails
- Agricultural edges
provided suitable:
- Insect prey
- Sunlight
- Refuge
remain available.
Activity
Western Fence Lizards are strongly:
diurnal.
Much of their daily behaviour revolves around:
- Basking
- Foraging
- Territorial displays
- Predator avoidance
- Mate searching
Morning activity
Animals commonly begin the day by basking.
As body temperature rises, they become increasingly:
- Alert
- Mobile
- Territorial
Midday behaviour
During excessive heat they may retreat to:
- Shade
- Vegetation
- Tree crevices
- Rock cracks
Captive animals must be able to do the same.
Basking behaviour
Western Fence Lizards frequently bask on:
- Fence posts
- Logs
- Rocks
- Tree trunks
often in elevated positions.
This behaviour should be actively accommodated in captivity.
Climbing
Although frequently seen on the ground, Western Fence Lizards are excellent:
climbers.
They should not be housed in a flat enclosure with no vertical structure.
Territorial displays
Males communicate through conspicuous:
- Push-ups
- Head movements
- Body posture
- Lateral presentation
These displays advertise:
- Territory
- Fitness
- Reproductive condition
Blue colouration
Adult males frequently possess vivid blue patches on:
- Belly
- Sides
- Throat
These markings can become especially pronounced during the reproductive season.
Females
Females generally have:
- Less intense blue colouration
- Less conspicuous throat markings
although some females retain visible blue pigmentation.
Temperament
Western Fence Lizards are alert and naturally wary.
Wild-origin animals can be:
extremely nervous.
Captive-bred animals generally adjust more readily to routine husbandry.
Handling
This species is best regarded primarily as:
an observation animal.
Handling should be limited to:
- Health examinations
- Weighing
- Transfers
- Veterinary care
Escape speed
Western Fence Lizards are:
very fast.
Always handle them in a secure room.
Tail autotomy
The species can voluntarily shed part of its tail if:
- Grabbed
- Injured
- Severely threatened
Never restrain a Western Fence Lizard by:
the tail.
Regrown tails
A regenerated tail is usually:
- Different in scale texture
- Different in colour
- Less structurally complex
than the original.
Tail loss therefore should not be treated as harmless simply because regeneration occurs.
Enclosure size
For one adult, provide at least approximately:
90 × 45 × 60 cm (3 × 1½ × 2 ft).
Preferred adult enclosure
Approximately:
120 × 60 × 60 cm (4 × 2 × 2 ft)
or larger is strongly preferred.
Why generous space matters
Larger accommodation allows:
- Better temperature gradients
- Greater UV gradients
- More climbing routes
- Natural territorial behaviour
- Better exercise
- More visual security
Large males
Large active males particularly benefit from:
120 cm (4 ft) or more enclosure length.
Enclosure orientation
A combination of:
horizontal floor area and usable height
is ideal.
Enclosure type
Suitable housing includes:
- Wooden vivaria
- PVC vivaria
- Large glass terraria
- Custom naturalistic enclosures
provided ventilation and lighting are adequate.
Ventilation
Provide:
strong ventilation.
Cross-flow ventilation is ideal.
Security
Check carefully for gaps around:
- Doors
- Cable ports
- Ventilation screens
A Western Fence Lizard can escape through surprisingly small spaces.
Climbing structure
Provide numerous:
- Branches
- Cork slabs
- Tree trunks
- Rock ledges
- Logs
- Shelves
Branch orientation
Use:
- Horizontal
- Diagonal
- Vertical
structures.
Elevated basking area
At least one sturdy elevated perch should pass beneath:
- Heat
- UVB
Multiple basking positions
A larger enclosure should ideally contain several positions allowing different combinations of:
- Heat
- UVB
- Visible light
Visual barriers
Provide areas where the animal can completely retreat from:
direct view.
Hides
Provide at least:
- Warm hide
- Cool hide
- Slightly humid hide
Natural refuges
Useful refuges include:
- Cork bark
- Rock crevices
- Hollow branches
- Dense vegetation
Substrate
Suitable substrates include mixtures of:
- Organic topsoil
- Washed sand
- Clay-rich soil
- Leaf litter
Substrate depth
Provide approximately:
8–10 cm (3–4 in)
as a useful minimum.
Deeper sections
Approximately:
12–15 cm (5–6 in)
is preferable in selected areas.
Burrowing behaviour
Western Fence Lizards are not dedicated burrowers, but they may:
- Dig shallow depressions
- Shelter beneath debris
- Enter soil cracks
Females also require substantial substrate for:
nesting.
Leaf litter
Leaf litter is particularly beneficial for animals from:
- Woodland
- Coastal
- Forest-margin
populations.
It provides:
- Cover
- Foraging enrichment
- Humidity gradients
Surface moisture
Most of the exposed substrate should be allowed to:
dry between watering or misting.
Humid microclimate
One sheltered area can remain:
slightly more humid.
Rocks
Provide stable flat rocks for:
- Basking
- Climbing
- Nail wear
Rock safety
Heavy stones should rest securely on the enclosure base rather than loose substrate.
Plants
Live or artificial plants can provide:
- Shade
- Visual cover
- Climbing opportunities
Suitable robust non-toxic planting may include species adapted to the selected humidity regime.
Temperature
Western Fence Lizards require a broad thermal gradient rather than uniformly high heat.
Day ambient temperature
Maintain most of the enclosure around:
24–29°C (75–84°F).
Warm zone
The warmer part of the enclosure can reach approximately:
28–31°C (82–88°F).
Basking surface
Provide an exposed basking surface around:
35–40°C (95–104°F).
Locality variation
Animals from very warm inland localities may voluntarily use somewhat hotter surfaces.
However, captive keepers should prioritise:
behavioural choice
rather than attempting to reproduce extreme midday air temperatures.
Cool area
Maintain a cooler shaded area around:
21–24°C (70–75°F).
Why cool retreats matter
Wild lizards escape excessive heat by using:
- Shade
- Crevices
- Vegetation
- Burrows
A captive animal must always have the same opportunity.
Night temperature
Allow nighttime temperatures to fall toward approximately:
15–21°C (59–70°F).
Locality-dependent nights
Mountain and northern populations may naturally experience nights below:
15°C (59°F)
during parts of the year.
Tropical-style warm nights should not automatically be imposed on all Western Fence Lizards.
Heating
Use:
overhead daytime heating.
Halogen flood lamp
A halogen flood is useful because it creates a broad warm surface.
Broad basking
The entire body should fit within the principal basking zone.
Heat mats
Underfloor heating is generally unnecessary as the primary heat source.
Natural warming is predominantly:
solar and overhead.
Thermostat
Use suitable thermostatic or other reliable safety control.
Temperature monitoring
Use:
- Digital thermometers
- Infrared thermometer
Measure both:
- Air temperature
- Surface temperature
UVB
Western Fence Lizards regularly bask in natural sunlight.
UVB should therefore be considered an important component of:
high-quality captive husbandry.
Suggested UV Index
Provide approximately:
UVI 3–5
at the principal exposed basking position.
UV gradient
Also provide:
- UVI 1–3 in partially exposed areas
- UVI below 1 beneath cover
- Retreats approaching UVI 0
UVB lamp
A suitable:
linear T5 UVB lamp
is generally preferable to relying on a small compact UV source.
Lamp selection
Required lamp output depends on:
- Enclosure height
- Reflector
- Mesh
- Distance
- Basking position
Mesh reduction
Mesh can reduce delivered UVB considerably.
UV meter
Where practical, measure UVI at:
actual animal height.
Visible light
Provide strong:
visible-spectrum lighting.
These are visually active animals from bright outdoor environments.
Daylight LED
A good daylight LED system can dramatically improve overall enclosure brightness.
Photoperiod
During the active season, approximately:
12–14 hours of daylight
is suitable.
Seasonal photoperiod
Winter photoperiod can gradually reduce toward:
9–11 hours
for populations undergoing natural seasonal cycling.
Night lighting
Provide:
complete darkness at night.
Humidity
Humidity requirements vary substantially according to locality.
General humidity
A useful broad captive target is approximately:
35–55%.
Coastal animals
Animals originating from coastal or northern populations may experience:
considerably higher overnight and morning humidity.
Inland animals
Interior populations may encounter much:
drier daytime conditions.
Humidity cycle
Natural fluctuation is preferable to maintaining one fixed percentage constantly.
Humid hide
Provide one humid refuge around approximately:
60–80% relative humidity.
Misting
Light misting can be used:
occasionally or several times weekly
depending on:
- Locality
- Enclosure ventilation
- Season
Avoid saturation
Do not maintain the whole enclosure continuously:
wet.
Water
Provide clean fresh water at all times.
Water bowl
Use a shallow stable dish that cannot easily tip.
Drinking
Some individuals drink readily from bowls.
Others may preferentially drink:
droplets after misting.
Diet
Western Fence Lizards are primarily:
insectivorous.
Natural prey
Wild diets include a broad variety of arthropods such as:
- Beetles
- Ants
- Flies
- Spiders
- Grasshoppers
- Crickets
- Caterpillars
- True bugs
Diet varies according to:
- Season
- Habitat
- Prey availability
Feeding philosophy
No single feeder insect should make up the entire diet.
Suitable staple feeders
Useful foods include:
- Crickets
- Locusts
- Small roaches
- Black soldier fly larvae
- Silkworms
Additional prey
Variety can include:
- Small hornworms
- Beetle larvae
- Captive-produced flies
- Other safe invertebrates
Mealworms
Mealworms can be included:
in moderation.
Waxworms
Waxworms should remain:
occasional treats
because of their high fat content.
Ants
Ants form part of the natural diet but are not required as the dominant captive food in the way they are for specialised horned lizards.
Wild insects
Wild-caught insects can provide excellent variety only when collected from:
- Pesticide-free areas
- Herbicide-free areas
- Sites free from environmental contamination
Correct identification is essential.
Fireflies
Never feed:
fireflies or lightning bugs.
They can contain highly toxic defensive compounds.
Prey size
Feed prey comfortably appropriate to the lizard’s head and body size.
Adult feeding
Healthy adults can generally be fed:
3–5 times weekly.
Juvenile feeding
Growing juveniles should receive appropriately sized insects:
daily or almost daily.
Feeding amount
Offer enough prey to maintain:
- Lean body condition
- Strong musculature
- Normal activity
Gut loading
Feeder insects should be:
properly gut loaded.
Calcium
Dust feeders regularly with an appropriate:
calcium supplement.
Multivitamin
Use a quality reptile multivitamin on a suitable schedule.
Vitamin D3
Dietary D3 supplementation should be adjusted according to:
actual UVB provision.
Over-supplementation
More supplementation is not automatically better.
Excessive vitamin and mineral supplementation can itself cause health problems.
Feeding enrichment
Allow natural hunting by varying:
- Feeding location
- Prey type
- Prey movement
Uneaten insects
Remove excessive uneaten feeder insects.
Large crickets may bite resting lizards.
Social housing
Individual housing is:
the safest general approach.
Adult males
Do not house adult males together in ordinary captive enclosures.
They are strongly:
territorial.
Territorial behaviour
Males may:
- Chase
- Bite
- Perform repeated push-ups
- Exclude rivals from basking areas
Male and female housing
Pairs can sometimes coexist in very large, structurally complex enclosures.
However, females must be monitored carefully for:
- Persistent mating attempts
- Chasing
- Weight loss
- Feeding suppression
Seasonal introductions
For breeding projects, introducing animals only during controlled breeding periods may be safer than:
permanent pair housing.
Female groups
Multiple females may sometimes coexist, but dominance can still occur.
Signs of social stress
Watch for:
- Constant hiding
- Reduced feeding
- Weight loss
- Exclusion from basking
- Chasing
- Bite injuries
Reproduction
Western Fence Lizards are:
oviparous — egg-laying.
Breeding season
Mating typically occurs during:
spring and early summer.
Timing varies substantially with:
- Elevation
- Latitude
- Climate
Seasonal emergence
Adults generally become reproductively active after winter dormancy and spring warming.
Courtship
Males may use:
- Push-ups
- Head movements
- Lateral displays
- Blue abdominal markings
during courtship and territorial encounters.
Female reproductive cycle
Females may produce:
multiple clutches per breeding season
in favourable low-elevation environments.
More northerly or high-elevation populations may have a:
shorter reproductive season.
Female preparation
Breeding females require:
- Strong UVB
- Appropriate calcium
- Excellent nutrition
- Deep nesting substrate
- Correct hydration
Gravid female
Signs may include:
- Abdominal enlargement
- Increased basking
- Restlessness
- Repeated digging
Nesting substrate
Provide at least approximately:
15–20 cm (6–8 in)
of suitable diggable substrate.
Preferred nesting depth
Approximately:
20–25 cm (8–10 in)
provides greater choice for mature females.
Nest substrate
A mixture of:
- Soil
- Sand
should be:
- Slightly moist below the surface
- Warm
- Diggable
- Able to retain a tunnel
Clutch size
Clutch size varies geographically and with female size.
Approximately:
3–17 eggs
may occur.
Many females produce clutches within approximately:
6–12 eggs.
Multiple clutches
In warmer climates, females may produce:
two or more clutches in a season.
Egg handling
If eggs are removed for incubation:
- Handle gently
- Avoid rotating them
- Maintain original orientation
- Prevent dehydration
Incubation medium
Suitable media include:
- Vermiculite
- Perlite
maintained:
moist but not saturated.
Incubation temperature
A conservative incubation range is approximately:
26–29°C (79–84°F).
Temperature variation
There is no need to incubate eggs at excessively high temperatures.
Moderate stable temperatures generally provide safer development.
Incubation duration
Hatching commonly occurs after approximately:
45–70 days
depending upon:
- Temperature
- Population
- Clutch
- Moisture
Hatchlings
Hatchlings are small and extremely fast.
They should generally be housed separately from adults.
Hatchling enclosure
Provide:
- Secure ventilation
- Small branches
- Cork
- Fine substrate
- Hides
- Bright lighting
- UVB
- Shallow water
Hatchling temperature
Maintain daytime ambient temperatures around:
24–28°C (75–82°F).
Hatchling basking
Provide a local basking surface around:
32–36°C (90–97°F).
Hatchling cool area
Maintain approximately:
21–24°C (70–75°F).
Hatchling night temperature
Allow temperatures to fall toward:
16–21°C (61–70°F).
Hatchling UVB
Provide approximately:
UVI 2–3
at accessible exposed basking positions.
Hatchling humidity
Maintain approximately:
40–60%
with access to a more humid hide.
Hatchling diet
Offer very small prey including:
- Pinhead crickets
- Tiny roach nymphs
- Small black soldier fly larvae
- Flightless fruit flies
- Other tiny suitable invertebrates
Hatchling feeding
Feed:
daily.
Hatchling supplementation
Provide:
- Proper gut loading
- Calcium
- Appropriate multivitamin supplementation
- Correct UVB
Juvenile growth
Young Western Fence Lizards grow rapidly when given:
- Correct heat
- Adequate UVB
- Frequent nutritious prey
Monitor growth with:
regular weighing.
Seasonal cycle
Western Fence Lizards experience substantial seasonal changes across most of their range.
Winter dormancy
Many populations enter:
winter dormancy or brumation.
Animals may shelter:
- Underground
- Beneath rocks
- Within logs
- In deep crevices
Geographic variation in brumation
Winter conditions differ dramatically between:
- Coastal California
- Washington
- Sierra Nevada
- Interior desert margins
A single rigid winter protocol is therefore inappropriate for all populations.
Captive brumation
Controlled winter cooling can be useful for:
- Reproductive cycling
- Seasonal behavioural rhythm
but should only be attempted with healthy established animals.
Do not brumate unhealthy animals
Do not deliberately cool animals that are:
- Underweight
- Ill
- Newly acquired
- Dehydrated
- Carrying unresolved parasites
Pre-brumation health assessment
Before intentional cooling, confirm:
- Stable weight
- Normal faeces
- Good hydration
- No obvious disease
Seasonal reduction
Gradually reduce:
- Photoperiod
- Basking duration
- Ambient temperature
- Feeding
rather than abruptly shutting down heat.
Feeding before cooling
Allow sufficient time for previously consumed food to:
digest completely
before significant cooling.
Spring warming
Reverse the process gradually by increasing:
- Photoperiod
- Basking
- Ambient temperature
- Feeding
Quarantine
All newly acquired animals should undergo quarantine.
At least:
90 days
is a sensible minimum.
Wild-origin animals
Wild-caught Western Fence Lizards may carry:
- Internal parasites
- Mites
- Other ectoparasites
- Injuries
- Chronic stress
Faecal examination
Veterinary faecal testing is especially advisable for:
- Wild-origin animals
- Animals of uncertain provenance
- Animals losing weight
Tick associations
Western Fence Lizards are frequently parasitised by:
ticks in the wild.
Any newly acquired wild-origin animal should be carefully checked for external parasites.
Lyme disease ecology
Western Fence Lizards have an unusual ecological relationship with ticks involved in transmission of Lyme disease.
Certain proteins within the lizard’s blood can reduce the survival of Borrelia bacteria inside feeding ticks.
This has made Sceloporus occidentalis important in research into:
western North American Lyme disease ecology.
It has no direct implication for ordinary captive husbandry but is an interesting feature of the species’ natural biology.
Black widow resistance
Research has also found that Western Fence Lizards living alongside black widow spiders possess increased resistance to:
black widow venom.
This should obviously never be tested in captivity.
Common health concerns
Potential problems include:
- Metabolic bone disease
- Burns
- Hyperthermia
- Dehydration
- Parasites
- Respiratory disease
- Retained shed
- Trauma
- Tail loss
- Reproductive complications
Metabolic bone disease
Possible signs include:
- Tremors
- Weakness
- Soft jaw
- Limb deformity
- Fractures
MBD prevention
Provide:
- Appropriate UVB
- Correct calcium
- Proper gut loading
- Suitable temperatures
Burns
Prevent animals from contacting:
- Lamps
- Heating elements
- Hot fittings
Hyperthermia
Never allow the entire enclosure to reach:
basking temperature.
Dehydration
Possible signs include:
- Sunken eyes
- Reduced activity
- Poor skin elasticity
- Weight loss
Parasites
Possible signs of significant parasite burden include:
- Weight loss
- Poor appetite
- Abnormal faeces
- Reduced activity
Respiratory disease
Warning signs include:
- Wheezing
- Clicking
- Nasal discharge
- Increased respiratory effort
- Open-mouth breathing away from normal basking
Retained shed
Check especially:
- Toes
- Tail tip
Trauma
Common causes include:
- Falls
- Unstable rocks
- Aggression
- Rough handling
- Escape attempts
Reproductive complications
Females may experience:
- Calcium depletion
- Egg retention
- Dystocia
Signs of possible dystocia
Seek veterinary care for:
- Persistent unsuccessful digging
- Severe lethargy
- Straining
- Weakness
- Continued abdominal enlargement
Veterinary red flags
Consult a suitably experienced reptile veterinarian for:
- Persistent anorexia
- Significant weight loss
- Tremors
- Weakness
- Severe dehydration
- Abnormal breathing
- Serious wounds
- Prolapse
- Suspected egg retention
Outdoor housing
In suitable climates, secure outdoor housing can be extremely beneficial.
Benefits
Outdoor accommodation can provide:
- Natural sunlight
- Natural temperature variation
- Fresh air
- Behavioural enrichment
Outdoor security
Housing must be:
- Escape-proof
- Predator-proof
- Secure against digging underneath
Shade
Provide abundant:
deep shade.
Natural sunlight
Unfiltered sunlight provides excellent:
- UVB
- Visible light
Glass blocks most useful UVB.
Overheating outdoors
Small outdoor enclosures can become dangerously hot even in climates where the species naturally occurs.
Always provide:
- Shade
- Water
- Cool retreats
Conservation status
The Western Fence Lizard remains:
widespread and common across much of its range.
It is not considered globally threatened.
Local populations
Individual populations can still be affected by:
- Habitat loss
- Development
- Road mortality
- Pesticide use
- Domestic cats
- Wild collection
Legal considerations
Native reptile collection and possession rules vary between:
- US states
- Protected areas
- National parks
- Wildlife management jurisdictions
California and other native states
Even common native reptiles may be subject to:
- Collection limits
- Permit requirements
- Commercial-sale restrictions
- Protected-area regulations
Never assume that a common backyard animal is automatically legal to:
collect and keep.
Protected land
Collection from:
- National parks
- Many state parks
- Protected reserves
is commonly prohibited regardless of species abundance.
CITES
The Western Fence Lizard is not generally listed under:
CITES.
However, domestic wildlife regulations still apply.
Captive-bred preference
For private husbandry, choose:
legally documented captive-bred animals whenever possible.
Why captive-bred is preferable
Captive-bred animals generally provide:
- Clearer provenance
- Lower parasite burden
- Better adjustment to captivity
- Less impact on wild populations
Provenance
Retain:
- Breeder records
- Purchase receipt
- Hatch date
- Locality information where available
- Import/export paperwork where applicable
Never release captive animals
Never release captive Western Fence Lizards into the wild.
Captive animals may:
- Carry unfamiliar pathogens
- Have unsuitable genetics
- Originate from distant populations
- Violate wildlife law if released
Common husbandry mistakes
Common mistakes include:
- Keeping the species in a very small enclosure
- Providing no climbing structure
- Treating it as completely terrestrial
- Keeping the enclosure dim
- Providing inadequate UVB
- Using a narrow pinpoint basking lamp
- Heating the entire enclosure excessively
- Providing no cool retreat
- Keeping nights permanently warm
- Maintaining completely desiccated conditions
- Keeping the enclosure wet and stagnant
- Poor ventilation
- Feeding only mealworms
- Failing to gut load insects
- Inadequate calcium supplementation
- Excessive vitamin supplementation
- Leaving large hungry crickets overnight
- Excessive handling
- Grabbing the tail
- Housing adult males together
- Providing no nesting substrate for females
- Attempting brumation with unhealthy animals
- Failing to quarantine wild-origin animals
- Collecting animals illegally
- Releasing captive animals
Responsible ownership
Before obtaining a Western Fence Lizard, ensure you can provide:
- Legally documented provenance
- At least approximately 90 × 45 × 60 cm (3 × 1½ × 2 ft) adult housing
- Preferably 120 × 60 × 60 cm (4 × 2 × 2 ft) or larger
- Extensive climbing structure
- Secure elevated basking perches
- Natural soil-based substrate
- Bright visible-spectrum lighting
- Appropriate UVB
- UVI approximately 3–5 at the principal basking position
- Broad basking temperatures around 35–40°C (95–104°F)
- Cooler areas around 21–24°C (70–75°F)
- Appropriate nighttime cooling
- Moderate general humidity
- A more humid retreat
- Fresh clean water
- A varied live-invertebrate diet
- Proper gut loading
- Calcium and vitamin supplementation
- Minimal unnecessary handling
- Individual housing where appropriate
- Deep nesting substrate for mature females
- Seasonal management appropriate to locality
- Quarantine facilities
- Access to a suitably experienced reptile veterinarian
Summary
The Western Fence Lizard (Sceloporus occidentalis) is an active diurnal lizard distributed across much of western North America.
Although modest in size, it needs considerably more than a small terrestrial tank.
For one adult, provide at least approximately:
90 × 45 × 60 cm (3 × 1½ × 2 ft),
with:
120 × 60 × 60 cm (4 × 2 × 2 ft)
or larger strongly preferred.
Provide abundant:
- Branches
- Cork
- Rocks
- Elevated basking sites
- Visual cover
Maintain daytime ambient temperatures around:
24–29°C (75–84°F),
with an exposed basking surface around:
35–40°C (95–104°F).
Provide a cooler region around:
21–24°C (70–75°F)
and allow nighttime temperatures to fall toward:
15–21°C (59–70°F),
with adjustments according to locality.
Maintain general humidity around:
35–55%
with access to more humid sheltered microclimates.
Provide strong appropriate UVB with approximately:
UVI 3–5
at the principal exposed basking site and extensive shaded areas.
Feed a varied insect diet including:
- Crickets
- Locusts
- Roaches
- Black soldier fly larvae
- Silkworms
- Other suitable invertebrates
with correct gut loading and supplementation.
Western Fence Lizards are:
egg-laying
and females require deep suitable nesting substrate. Clutch size varies substantially with population and female size, with approximately:
3–17 eggs
possible and many clutches falling within approximately:
6–12 eggs.
The species experiences pronounced seasonal changes across much of its range. Controlled seasonal cycling may therefore be beneficial for healthy adults, particularly where breeding is intended.
Adult males are territorial and should normally be:
housed individually.
Western Fence Lizards remain common across much of their native range, but wild collection and possession may be regulated locally. Documented captive-bred animals should therefore be preferred.
With generous space, strong lighting, appropriate UVB, extensive climbing structure, genuine thermal choice and a varied insect diet, the Western Fence Lizard can be an active, engaging and comparatively manageable Sceloporus species for the responsible keeper.
IMPORTANT INFORMATION:
This care sheet provides general husbandry guidance and does not replace species-specific research or veterinary advice. Individual requirements may vary.
Always check current legislation governing the acquisition, collection, import, transport, keeping, breeding or sale of reptiles in your jurisdiction.
If you have concerns about an animal’s health or care, consult a suitably experienced exotic or reptile veterinarian.
Information correct at the date of publication.
reptilecommunity.com | Revised: August 2026