Southern Alligator Lizard (Elgaria multicarinata) Care Sheet
The Southern Alligator Lizard (Elgaria multicarinata) is a long-bodied, powerful member of the family Anguidae native to western North America. It is primarily terrestrial but readily climbs low vegetation, shrubs, logs and rough surfaces, and it occupies a wide variety of habitats including chaparral, grassland, woodland and relatively moist riparian environments.
Adults can reach approximately 43 cm (17 in) total length, much of which is tail.
Although sometimes treated as a hardy “room-temperature” lizard, good captive care should provide a genuine thermal gradient, suitable UVB, access to moisture without permanently wet conditions, extensive ground cover and hiding places, and enough floor space for natural exploration.
Successful husbandry requires:
- Generous terrestrial floor space
- Numerous secure hides
- A deep, naturalistic substrate
- Moderate daytime temperatures
- A limited warm basking area
- A meaningful nighttime temperature reduction
- Moderate humidity with access to a humid retreat
- Good ventilation
- Appropriate UVB
- A varied live-invertebrate diet
- Minimal unnecessary handling
- Individual housing as the safest default
Captive-bred animals should be strongly preferred whenever available.
Quick facts
Scientific name: Elgaria multicarinata
Common name: Southern Alligator Lizard
Family: Anguidae
Origin: Western North America
Lifestyle: Primarily terrestrial, with some climbing
Activity: Primarily diurnal; can become partly nocturnal during hot periods
Adult size: Up to approximately 17 in (43 cm) total length
Diet: Primarily invertebrates, with occasional small vertebrate prey in the wild
Day ambient temperature: Approximately 70–78°F (21–26°C)
Warm/basking surface: Approximately 82–88°F (28–31°C)
Cool area: Approximately 65–72°F (18–22°C)
Night temperature: Approximately 58–68°F (14–20°C)
General humidity: Approximately 40–60%, with locally higher humidity in retreats
UVB: Recommended
Suggested UVI: Approximately 2–3 at the principal exposed basking area, with shaded retreats approaching zero
Adult enclosure: At least approximately 36 × 18 × 18 in (90 × 45 × 45 cm) for one adult; 48 × 24 × 24 in (120 × 60 × 60 cm) or larger strongly preferred
Housing: Individual housing safest
Reproduction: Egg-laying
Clutch size: Commonly 5–20 eggs
Handling: Minimal to moderate, depending on temperament
Experience level: Beginner to intermediate when captive-bred and legally obtained
Taxonomy
The accepted scientific name is:
Elgaria multicarinata
The species belongs to:
Family: Anguidae
Genus: Elgaria
The Reptile Database currently recognises Elgaria multicarinata as a valid species and confirms that it is oviparous.
Older literature may use names such as:
Gerrhonotus multicarinatus
or:
Cordylus multicarinatus.
ITIS lists both as historical synonyms.
Subspecies
Several geographic forms have historically been recognised, including:
- Elgaria multicarinata multicarinata
- Elgaria multicarinata scincicauda
- Elgaria multicarinata webbii
Taxonomic treatments have changed over time, and some island forms have been reassessed. The Reptile Database, for example, notes evidence that the former island form nana is conspecific with E. multicarinata.
For captive records, retain any known locality or subspecies information rather than assigning it based solely on appearance.
Natural distribution
The Southern Alligator Lizard occurs along much of the western margin of North America.
Its range includes portions of:
- Washington
- Oregon
- California
- Baja California
NatureServe records the species in Washington, Oregon and California, while broader range treatments extend it south into northern Baja California.
Natural habitat
This is a highly adaptable species.
Natural habitats include:
- Grassland
- Chaparral
- Oak woodland
- Mixed woodland
- Open pine forest
- Riparian areas
- Rocky slopes
- Talus
- Brush piles
- Wood piles
In drier parts of its range, it is often associated with:
moister, vegetated microhabitats.
Shelter use
Wild individuals commonly hide beneath:
- Logs
- Rocks
- Bark
- Dense vegetation
- Wood piles
- Debris
Captive animals should therefore have multiple low, secure shelters rather than one open cave.
Activity
The species is primarily:
diurnal.
However, NatureServe notes that during warmer parts of the year it may become partly nocturnal.
This flexibility reinforces the importance of giving the animal:
- Thermal choice
- Shaded retreat
- Day/night lighting
- Cooler nighttime conditions
Behaviour
Southern Alligator Lizards are:
- Alert
- Predatory
- Strong
- Capable climbers
- Often defensive when restrained
They frequently investigate their surroundings and can become surprisingly active in a well-structured enclosure.
Defensive behaviour
A frightened individual may:
- Freeze
- Flee rapidly
- Twist the body
- Open the mouth
- Bite
- Defecate
- Drop the tail
The species has strong jaws.
A defensive bite can be painful and may break the skin.
Enclosure size
For one adult, provide at least approximately:
36 × 18 × 18 in (90 × 45 × 45 cm).
For long-term adult housing, approximately:
48 × 24 × 24 in (120 × 60 × 60 cm)
or larger is strongly preferred.
Why floor area matters
This species moves extensively across the ground.
Additional floor space allows:
- Better thermal gradients
- More hides
- More feeding opportunities
- More natural movement
- Greater environmental complexity
- Better separation between warm and cool areas
Enclosure orientation
Housing should be primarily:
terrestrial.
Moderate height remains useful for:
- Low branches
- Cork
- Plants
- Rocks
- UVB and basking gradients
Climbing opportunities
Although primarily terrestrial, Southern Alligator Lizards do climb.
Provide:
- Low branches
- Cork bark
- Stable logs
- Sloping rocks
- Dense plants
The enclosure should not be a flat, empty box.
Escape security
These lizards are strong and persistent.
Check:
- Door gaps
- Ventilation openings
- Cable ports
- Sliding door overlap
- Lid security
Ventilation
Good ventilation is important.
The species benefits from access to moisture but should not live in:
stagnant, permanently humid air.
Substrate
A naturalistic substrate can consist of:
- Organic topsoil
- Leaf litter
- Fine bark
- A smaller proportion of sand
- Clay-rich soil
The aim is to reproduce:
cool, earthy, structurally varied ground
rather than dry desert sand.
Substrate depth
Provide at least:
3–4 in (8–10 cm)
of substrate.
Deeper areas of:
4–6 in (10–15 cm)
are beneficial.
Why substrate depth matters
Deeper substrate allows:
- Digging
- Moisture gradients
- Cooler retreat areas
- Egg-laying behaviour
- Natural microbial activity in bioactive systems
Leaf litter
A substantial layer of leaf litter is highly useful.
It provides:
- Cover
- Enrichment
- Humidity buffering
- Foraging opportunities
- Support for clean-up crew
Hides
Provide at least:
- One warm hide
- One cool hide
- One humid retreat
Preferably provide several more.
Hide style
Suitable hides include:
- Cork flats
- Bark slabs
- Low artificial caves
- Stable rocks
- Hollow logs
Low, close-fitting hides often provide greater security than oversized open shelters.
Humid retreat
Provide a humid hide containing:
- Slightly moist soil
- Damp sphagnum
- Moist leaf litter
The retreat should be:
moist, not saturated.
Rocks and heavy furnishings
Any heavy furnishings must be:
securely supported.
Do not balance heavy rocks on loose substrate where digging could destabilise them.
Temperature
Southern Alligator Lizards should not be maintained as high-temperature desert lizards.
Provide moderate daytime temperatures.
Day ambient temperature
Maintain most of the enclosure around:
70–78°F (21–26°C).
Warm area
Provide a limited warm area around:
80–84°F (27–29°C).
Basking surface
A basking surface around:
82–88°F (28–31°C)
is appropriate.
This should be a small, optional zone.
Cool area
Maintain access to cooler areas around:
65–72°F (18–22°C).
Why cool retreats matter
NatureServe reports that wild animals remain active across a broad range of body temperatures and occupy varied habitats, including relatively cool environments.
The entire enclosure should never be kept at basking temperature.
Night temperature
Allow nighttime temperatures to fall toward approximately:
58–68°F (14–20°C).
Healthy adults generally benefit from a meaningful nighttime reduction.
Seasonal cooling
A moderate winter cooling period can be appropriate for healthy adults.
This can involve:
- Shorter photoperiod
- Cooler daytime temperatures
- Cooler nights
- Reduced feeding
Do not place animals into extreme cold without experience and preparation.
Heating
Use primarily:
thermostatically controlled overhead heating.
A low-wattage halogen or radiant heat source can create a limited basking zone.
Heat mats
Heat mats should not be relied upon as the sole source of heat.
Overhead heating creates a more natural:
warm surface → cooler depth
gradient.
Thermostat
All significant heat sources should be controlled by an:
appropriate thermostat.
Temperature monitoring
Use digital thermometers at:
- Warm end
- Cool end
An infrared thermometer is useful for checking:
- Basking surface
- Rocks
- Bark
- Substrate
Lighting
Provide a clear daytime light period.
This is primarily a:
diurnal species.
Bright visible lighting helps support:
- Normal activity
- Circadian rhythm
- Basking
- Plant growth
Photoperiod
Approximately:
12 hours light / 12 hours dark
is suitable for routine care.
Seasonal variation can be used.
Night lighting
Provide genuine darkness at night.
Do not use permanently illuminated:
- Red bulbs
- Blue bulbs
- Purple bulbs
- “Moonlight” lamps
UVB
UVB is recommended.
Because the species is primarily diurnal and naturally exposed to daylight, providing appropriate UVB is preferable to relying entirely upon dietary vitamin D3.
Suggested UV Index
Aim for approximately:
UVI 2–3
at the principal exposed basking position.
Also provide:
- UVI below 1 in shaded areas
- Hides approaching UVI 0
UV gradient
The animal must be able to choose between:
- Full exposure
- Partial shade
- Complete retreat
Do not illuminate the entire enclosure uniformly with high UV.
Lamp choice
A:
low-to-moderate output linear UVB lamp
covering part of the enclosure is generally appropriate.
The exact lamp depends upon:
- Mesh
- Distance
- Reflector
- Enclosure height
- Basking position
UV measurement
Where possible, use a UV meter.
Measure actual UVI at:
the surfaces the animal can occupy.
Humidity
Maintain general humidity around:
40–60%.
However, humidity should fluctuate naturally rather than remaining fixed.
Local humidity
Provide locally higher humidity in:
- Humid hide
- Deeper substrate
- Leaf litter
- Plant cover
This is especially important during shedding.
Misting
Light misting:
several times per week
is usually appropriate.
Frequency should be adjusted according to:
- Room humidity
- Ventilation
- Season
- Substrate
- Individual hydration
Do not keep the enclosure wet
Avoid:
- Constantly saturated substrate
- Permanently wet glass
- Stagnant air
The goal is:
access to moisture without swamp-like conditions.
Water
Provide a:
shallow dish of fresh water at all times.
The dish should be large enough for easy access but shallow enough to be safe.
Diet
Southern Alligator Lizards are primarily:
carnivorous and insectivorous.
NatureServe records a broad diet including insects, spiders, slugs, centipedes and scorpions, with occasional small vertebrate prey.
Suitable captive feeders
Suitable foods include:
- Crickets
- Roaches
- Locusts
- Black soldier fly larvae
- Silkworms
- Earthworms
- Snails from safe captive sources
- Appropriate beetle larvae
- Occasional hornworms
Feeder variety
Do not rely solely upon:
crickets.
A broad feeder rotation is preferable.
Vertebrate prey
Wild adults may consume:
- Small lizards
- Small mammals
- Bird eggs or young
but routine vertebrate feeding is unnecessary in captivity.
A varied invertebrate diet is preferable for routine long-term husbandry.
Gut loading
Feeder insects should be:
properly gut loaded.
Provide nutritious food and hydration before feeding.
Calcium
Dust feeders appropriately with:
calcium.
Supplementation should account for:
- UVB provision
- Age
- Growth
- Sex
- Reproductive condition
Multivitamin
Use a suitable reptile multivitamin according to a sensible schedule.
Avoid chronic oversupplementation.
Adult feeding
Healthy adults can generally be fed:
2–3 times per week.
Adjust according to:
- Body condition
- Activity
- Season
- Reproductive status
Juvenile feeding
Growing juveniles should be fed more frequently.
Offer appropriately sized prey approximately:
4–5 times per week.
Feeding enrichment
Allow some suitable prey to move naturally through:
- Leaf litter
- Cork
- Low branches
This encourages natural:
- Searching
- Stalking
- Ambush behaviour
Uneaten feeders
Remove excessive uneaten crickets.
They can:
- Bite resting reptiles
- Stress the animal
- Hide in the enclosure
Handling
Routine handling should be:
minimal.
Some captive individuals become tolerant of gentle handling, but this is not a species that requires regular handling to thrive.
Bite risk
Adults possess:
strong jaws.
A defensive bite can be painful.
Never intentionally provoke the animal.
Handling method
When handling is necessary:
- Support the body
- Avoid squeezing
- Allow the lizard to move between hands
- Keep sessions brief
- Work close to the floor
Tail safety
Never restrain the animal by:
the tail.
Tail autotomy can occur.
Social housing
Individual housing is the:
safest default.
Male aggression
Adult males can be territorial.
Do not routinely house:
adult males together.
Pair housing
Experienced keepers may introduce a compatible:
male and female
for breeding.
Permanent pair housing is not essential.
Signs of incompatibility
Watch for:
- Chasing
- Bite injuries
- Tail damage
- Feeding suppression
- Persistent hiding
- Weight loss
Separate animals immediately if necessary.
Sexing
Adult males may develop:
- Broader heads
- More robust jaw musculature
- More obvious hemipenal region
Sexing juveniles can be difficult.
Breeding
Elgaria multicarinata is:
oviparous — egg-laying.
Only breed animals that are:
- Mature
- Healthy
- Feeding reliably
- Well hydrated
- In excellent body condition
Seasonal reproduction
NatureServe reports egg laying between:
May and July
in wild populations.
This corresponds with the species’ seasonal temperate biology.
Clutch size
Clutch size generally varies with female size.
NatureServe reports a usual range of:
5–20 eggs.
Number of clutches
Females may produce:
one to three clutches
during the reproductive season.
Egg-laying sites
Natural egg-laying sites include:
- Burrows
- Stable talus
- Protected underground spaces
according to NatureServe.
Captive females should therefore have access to:
deep, slightly moist, diggable substrate.
Nesting substrate
Provide a nesting area at least:
4–6 in (10–15 cm)
deep.
It should be:
- Diggable
- Slightly moist
- Not saturated
Gravid females
Monitor gravid females for:
- Appetite changes
- Increased digging
- Body condition
- Hydration
- Calcium needs
Do not allow a breeding female to become depleted.
Egg handling
If eggs are excavated:
- Handle gently
- Avoid unnecessary rotation
- Maintain approximate orientation
- Do not allow eggs to dry out completely
- Do not place eggs directly in standing water
Incubation
A conservative captive incubation range is approximately:
72–78°F (22–26°C).
Temperate anguids should not be incubated at the high temperatures commonly used for some tropical geckos.
Incubation medium
Suitable media include:
- Vermiculite
- Perlite
- Carefully prepared soil-based incubation setups
The medium should be:
moist, not wet.
Incubation time
Incubation duration varies considerably with temperature.
Wild hatchlings commonly emerge around:
September or October.
Under controlled captive conditions, expect development to take:
several weeks to a few months
depending upon incubation temperature.
Hatchlings
Hatchlings should normally be reared separately from adults.
Hatchling enclosure
Provide:
- Secure terrestrial housing
- Small hides
- Leaf litter
- Fine cork
- Appropriate UVB
- Shallow water
- Moderate humidity
Hatchling temperature
Maintain most daytime temperatures around:
68–75°F (20–24°C)
with a small warmer area around:
78–82°F (26–28°C).
Hatchling night temperature
Allow nighttime temperatures to fall toward approximately:
60–68°F (16–20°C).
Hatchling humidity
Maintain moderate humidity with:
- Moist leaf litter
- A small humid retreat
- Good ventilation
Avoid saturated conditions.
Hatchling diet
Suitable foods include:
- Pinhead crickets
- Small roach nymphs
- Small black soldier fly larvae
- Tiny earthworms
- Small flies
- Other appropriately sized live invertebrates
Hatchling feeding
Offer food:
daily or near-daily during early growth.
Hatchling supplementation
Feeders should be:
- Gut loaded
- Lightly calcium dusted
- Supplemented appropriately with vitamins
Provide low-level UVB.
Quarantine
All newly acquired animals should undergo quarantine.
At least:
90 days
is a sensible minimum.
Longer quarantine may be appropriate for:
- Wild-caught animals
- Animals of uncertain origin
- Recent imports
Wild-caught animals
Wild-caught Southern Alligator Lizards may carry:
- Internal parasites
- External parasites
- Dehydration
- Injuries
- Chronic stress
Captive-bred animals should be preferred.
Parasite screening
Veterinary faecal examinations are particularly useful for:
- Wild-caught animals
- Animals losing weight
- Animals with abnormal faeces
Common health concerns
Potential problems include:
- Overheating
- Dehydration
- Retained shed
- Nutritional deficiencies
- Metabolic bone disease
- Parasites
- Respiratory disease
- Trauma
- Obesity
- Reproductive complications
Overheating
One of the most common mistakes is keeping temperate alligator lizards:
too hot.
Possible signs include:
- Persistent escape behaviour
- Open-mouth breathing
- Lethargy
- Weakness
- Abnormal posture
Review enclosure temperatures immediately.
Dehydration
Possible signs include:
- Sunken eyes
- Poor shedding
- Lethargy
- Weight loss
Review:
- Water access
- Humid retreat
- Temperature
- Misting
Retained shed
Pay particular attention to:
- Toes
- Tail
- Around the eyes
Persistent shedding problems may indicate incorrect hydration or underlying illness.
Metabolic bone disease
Potential signs include:
- Tremors
- Weakness
- Soft jaw
- Limb deformity
- Abnormal movement
Prevention requires appropriate:
- UVB
- Calcium
- Vitamin supplementation
- Feeder nutrition
Obesity
Adults can become overweight when:
- Fed too frequently
- Given excessive fatty feeders
- Kept in undersized enclosures
Monitor body condition rather than appetite alone.
Respiratory disease
Warning signs include:
- Open-mouth breathing
- Wheezing
- Clicking
- Nasal discharge
- Increased respiratory effort
Seek veterinary assessment.
Trauma
Potential injuries include:
- Bite wounds
- Tail loss
- Falls
- Crushing from unstable décor
Separate incompatible animals and secure furnishings.
Reproductive problems
Breeding females may experience:
- Calcium depletion
- Poor body condition
- Egg retention
Possible warning signs include:
- Persistent swelling
- Straining
- Repeated digging without laying
- Weakness
- Loss of appetite
Seek veterinary assistance promptly.
Veterinary red flags
Seek a suitably experienced reptile veterinarian for:
- Persistent anorexia
- Significant weight loss
- Severe dehydration
- Abnormal breathing
- Tremors
- Weakness
- Major wounds
- Persistent abnormal faeces
- Neurological signs
- Prolapse
- Suspected egg retention
Cleaning
Spot-clean regularly.
Remove:
- Faeces
- Dead prey
- Shed skin
- Mould
- Contaminated substrate
Water hygiene
Clean and refill the water dish regularly.
Bioactive housing
The species can do well in a properly established:
temperate bioactive enclosure.
Suitable clean-up crew may include:
- Springtails
- Appropriate isopods
Maintain suitable moisture gradients rather than making the whole enclosure wet.
Bioactive maintenance
Bioactive does not mean maintenance-free.
Continue to:
- Remove large faecal deposits
- Remove dead prey
- Check drainage
- Maintain plants
- Monitor mould
- Inspect equipment
Disinfection
For deeper cleaning:
- Remove the lizard
- Use an appropriate reptile disinfectant
- Follow correct dilution
- Observe required contact time
- Rinse where necessary
- Allow surfaces to become safe before reintroduction
Never mix disinfectants.
Conservation and sourcing
The Southern Alligator Lizard is widespread across substantial parts of western North America and occupies a broad range of habitats.
However, abundance does not justify casual wild collection.
Legal considerations
Wild reptile collection laws vary significantly between:
- U.S. states
- Mexican jurisdictions
- Countries of import
Some populations may be protected or subject to collection limits.
Always verify current laws before:
- Collecting
- Buying
- Selling
- Importing
- Exporting
- Transporting
Captive-bred preference
Where possible, obtain:
documented captive-bred animals.
Ask for:
- Hatch date
- Parent information
- Locality if known
- Feeding history
- Supplementation
- UVB provision
- Health history
Never release captive animals
Never release a captive Southern Alligator Lizard into the wild.
Released animals may:
- Die
- Spread disease
- Mix genetically distinct populations
- Establish outside their natural range
Responsible rehoming is the appropriate alternative.
Common husbandry mistakes
Common mistakes include:
- Keeping the species too hot
- Providing no cool retreat
- Providing no nighttime temperature reduction
- Using an enclosure with too little floor space
- Providing too few hides
- Keeping the enclosure excessively dry
- Keeping the enclosure permanently wet
- Providing no humid retreat
- Poor ventilation
- Providing no UVB
- Providing excessive UVB without shade
- Feeding only crickets
- Poor gut loading
- Incorrect supplementation
- Overfeeding fatty prey
- Routine vertebrate feeding
- Excessive handling
- Grabbing the tail
- Housing incompatible adults together
- Providing insufficient nesting substrate
- Incubating eggs too hot
- Failing to quarantine new animals
- Collecting wild animals without checking legislation
Responsible ownership
Before obtaining a Southern Alligator Lizard, ensure you can provide:
- Generous terrestrial floor space
- Deep naturalistic substrate
- Abundant leaf litter
- Multiple secure hides
- Low climbing opportunities
- Moderate daytime temperatures
- A limited basking area
- A cool retreat
- Significant nighttime cooling
- Moderate humidity
- A humid hide
- Fresh drinking water
- Appropriate UVB
- A varied live-invertebrate diet
- Proper supplementation
- Minimal handling
- Quarantine
- Veterinary care
- Legal provenance
- Long-term commitment
Summary
The Southern Alligator Lizard (Elgaria multicarinata) is a primarily terrestrial, temperate anguine lizard from western North America.
Adults can reach approximately:
17 in (43 cm) total length.
For one adult, provide at least approximately:
36 × 18 × 18 in (90 × 45 × 45 cm),
with approximately:
48 × 24 × 24 in (120 × 60 × 60 cm)
or larger strongly preferred.
Provide:
- Deep soil-based substrate
- Leaf litter
- Cork
- Logs
- Multiple hides
- Low climbing structures
Maintain most daytime temperatures around:
70–78°F (21–26°C)
with a limited basking surface around:
82–88°F (28–31°C).
Allow nighttime temperatures to fall toward:
58–68°F (14–20°C).
Maintain general humidity around:
40–60%
with locally humid retreats and good ventilation.
Provide UVB around:
UVI 2–3
at the principal exposed basking position with extensive shade.
Feed a varied diet of appropriately sized, gut-loaded and correctly supplemented live invertebrates.
Routine handling should be minimal.
Individual housing is the safest default.
Females are egg-laying and commonly produce:
5–20 eggs per clutch,
with one to three clutches possible during the reproductive season.
Captive-bred animals with clear legal provenance should be preferred.
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