Hosmer’s Skink (Egernia hosmeri) Care Sheet
Hosmer’s Skink (Egernia hosmeri) is a robust Australian skink characterised by a broad head, powerful body, strongly keeled scales and a heavily spined tail. It is primarily associated with rocky habitats, where animals use narrow crevices for shelter, security and thermoregulation.
Like several members of the genus Egernia, Hosmer’s Skinks can display complex social behaviour and may form stable associations with compatible animals. However, this does not mean unfamiliar individuals can simply be housed together. Space, compatibility and careful monitoring remain essential.
They are diurnal basking reptiles requiring high-quality overhead heating, effective UVB, bright visible lighting and a substantial thermal and light gradient. Their enclosure should be structured around secure rockwork and crevices rather than being an open, sparsely furnished vivarium.
Hosmer’s Skinks are omnivorous and require a varied diet containing appropriate plant material alongside invertebrate prey.
They can be very long-lived and should be considered a substantial long-term commitment.
Quick Facts
Scientific name: Egernia hosmeri
Common name: Hosmer’s Skink
Family: Scincidae
Native range: Northeastern Australia
Activity: Diurnal
Lifestyle: Terrestrial and strongly rock-associated
Adult size: Approximately 25–30 cm total length
Lifespan: 15–20+ years may be achievable with excellent husbandry
Experience level: Intermediate
Diet: Omnivorous
Adult enclosure: 120 × 60 × 60 cm minimum for one adult; larger strongly preferred
Basking surface: Approximately 40–45°C
Warm ambient: Approximately 28–32°C
Cool area: Approximately 22–26°C
Night temperature: Approximately 18–22°C
UVB: Essential
Target basking UVI: Approximately 3–5
Humidity: Generally relatively dry, with access to more humid sheltered microclimates
Water: Fresh water available continuously
Social housing: Possible with compatible established animals; careful monitoring essential
Reproduction: Viviparous — gives birth to live young
Natural Distribution and Habitat
Hosmer’s Skink is native to northeastern Australia, particularly Queensland.
It is strongly associated with rocky environments including:
- Rocky outcrops
- Boulder fields
- Rock piles
- Cracks and crevices
- Dry woodland
- Open rocky country
Crevices are fundamental to the species’ ecology. They provide protection from predators and environmental extremes while allowing animals to emerge rapidly for basking and feeding.
A captive enclosure should therefore reproduce the important functional features of this environment rather than simply attempting to look Australian.
Appearance
Hosmer’s Skinks possess:
- Broad heads
- Robust bodies
- Powerful limbs
- Strong claws
- Rough, keeled scales
- Distinctively spiny tails
Adults generally reach approximately:
25–30 cm total length.
Size varies between individuals and according to sex, genetics and nutrition.
Behaviour and Temperament
Hosmer’s Skinks are active during daylight.
Normal behaviour includes:
- Basking
- Exploring
- Feeding
- Climbing over rocks
- Moving between crevices
- Watching activity outside the enclosure
- Social interaction
Established captive animals can become confident and food-motivated.
Some learn routine keeper activity and may voluntarily approach when food is expected.
They should nevertheless be regarded primarily as animals for observation rather than reptiles requiring frequent handling.
Crevice Behaviour
A frightened Hosmer’s Skink may wedge itself firmly inside a narrow crevice.
This is normal defensive behaviour.
Never forcibly pull a wedged animal from a retreat.
Do not pull by the:
- Tail
- Legs
- Head
Forcing an animal from a crevice can result in serious injury.
Handling
When handling is necessary:
- Support the entire body
- Keep the animal close to a safe surface
- Avoid squeezing
- Never restrain it by the tail
- Keep sessions short
Voluntary interaction should be encouraged whenever practical.
Enclosure Size
For a single adult, approximately:
120 × 60 × 60 cm
should be regarded as a practical minimum.
Larger accommodation is strongly preferred.
An enclosure around:
150–180 × 60–90 × 60–90 cm
provides considerably more opportunity for:
- Exercise
- Thermal choice
- Rockwork
- Multiple retreats
- Foraging
- Behavioural enrichment
Group accommodation requires substantially more space.
Do not simply add additional animals to an enclosure designed for one.
Enclosure Design
Floor area should be prioritised, although moderate height is useful for constructing:
- Raised rock ledges
- Low climbing structures
- Elevated basking areas
The enclosure should be:
- Secure
- Robust
- Well ventilated
- Escape-proof
Rockwork and Crevices
Secure rockwork is one of the most important aspects of Hosmer’s Skink husbandry.
Provide:
- Flat basking ledges
- Narrow crevices
- Larger retreats
- Warm shelters
- Cool shelters
- Shaded areas
Some retreats should fit relatively closely around the animal.
A large open cave does not provide the same sense of security as a narrow rock crevice.
Artificial rock structures can work extremely well and may reduce enclosure weight.
Rock Safety
Heavy rocks must be secured.
Do not balance heavy stone on loose substrate because skinks may dig beneath it.
Rock structures should be:
- Supported from the enclosure base
- Mechanically stable
- Unable to collapse if substrate is moved
Substrate
A naturalistic substrate can contain:
- Organic topsoil
- Washed play sand
- Clay-rich soil
A depth of approximately:
10–20 cm
is useful.
Although Hosmer’s Skinks are primarily rock-associated, they may dig and investigate beneath furnishings.
Most exposed substrate can remain relatively dry while deeper and protected areas retain slightly more moisture.
Furnishings
Additional furnishings can include:
- Cork bark
- Logs
- Low branches
- Leaf litter
- Safe hardy plants
Provide visual barriers so an animal does not feel permanently exposed.
Enrichment
Useful enrichment includes:
- Live-prey hunting
- Food searching
- Different substrate textures
- Multiple basking levels
- Leaf litter
- Scent trails
- Changing feeding locations
Environmental complexity is more useful than repeatedly handling the animal for stimulation.
Temperature
Hosmer’s Skinks require a strong daytime thermal gradient.
Basking Surface
Aim for approximately:
40–45°C
at the principal basking surface.
Warm Ambient
Approximately:
28–32°C
Cool Area
Approximately:
22–26°C
Night
Approximately:
18–22°C
is generally suitable for healthy established animals.
A natural nighttime temperature reduction is beneficial.
Surface Temperature Versus Air Temperature
A basking rock measuring 43°C does not mean the enclosure air should be 43°C.
The enclosure should provide:
hot basking surface → warm zone → cooler zone → sheltered retreat
This allows the skink to regulate its own body temperature.
Heating
Overhead daytime heating should be used.
Suitable options include:
- Halogen flood lamps
- Appropriate incandescent basking lamps
The basking area should be broad enough to warm a useful proportion of the animal’s body.
Avoid creating one tiny, excessively intense hot spot.
Heat mats should not be relied upon as the principal daytime heat source.
Internally mounted heat lamps must be appropriately guarded.
Heating equipment should be appropriately controlled, with actual temperatures checked independently.
Measuring Temperatures
Use:
Digital probe thermometer — ambient air temperature
Infrared thermometer — basking surface temperature
Check temperatures at several locations rather than measuring only one part of the enclosure.
UVB
Appropriate UVB is an essential component of comprehensive long-term Hosmer’s Skink husbandry.
These are diurnal basking reptiles naturally exposed to sunlight.
Target UVI
Aim approximately for:
UVI 3–5 at the principal basking position.
The enclosure must also provide areas of much lower exposure and complete UV shade.
What Is UVI?
UVI means Ultraviolet Index.
In practical reptile husbandry, it tells us how much biologically effective ultraviolet radiation reaches the animal at a particular location.
This is more useful than simply stating a UVB lamp percentage.
Why Doesn’t the UVB Percentage Tell Me Everything?
A lamp labelled:
- 6%
- 7%
- 10%
- 12%
- 14%
does not tell us by itself how much UV reaches the skink.
Actual exposure depends upon:
- Exact lamp model
- Reflector
- Distance from the animal
- Mesh between lamp and animal
- Lamp age
- Height of the basking surface
This is why the care sheet gives a target UVI rather than prescribing one UVB percentage for every enclosure.
UV Gradient
A well-designed enclosure should provide approximately:
Main basking area: UVI 3–5
Surrounding illuminated area: UVI 1–3
Partial shade: below UVI 1
Deep crevices: approaching UVI 0
The skink should always be able to leave UV exposure completely.
What UVB Lamp Do I Actually Buy?
For most adult Hosmer’s Skink enclosures, look for a:
QUALITY LINEAR T5 HO UVB SYSTEM
rather than relying upon a small compact UVB bulb.
Depending on enclosure height, lamp mounting and mesh, a system broadly within the:
6–12% UVB class
may be appropriate.
That does not mean a 12% lamp is automatically better than a 6% lamp.
The correct lamp is the one that produces approximately:
UVI 3–5 at the animal’s basking position
when installed correctly.
Understanding Distance
In simple terms:
Closer UVB lamp = generally greater UV exposure
Farther away = generally lower UV exposure
Mesh between lamp and skink = usually reduces exposure
Higher basking platform = animal closer to lamp
A moderate-output tube mounted relatively close may therefore produce similar exposure to a stronger tube positioned farther away.
At the Reptile Shop or Expo
If you do not understand all the percentages and lamp names, ask for:
a quality linear T5 HO UVB system suitable for a day-active Australian basking skink.
Explain that you need approximately:
UVI 3–5 at the basking position.
The correct installation distance should then be determined for the exact lamp and enclosure.
Do not simply ask for:
“the strongest desert UVB.”
More UV is not automatically better.
Heat, Light and UVB
The principal basking area should bring together:
HEAT + UVB + BRIGHT VISIBLE LIGHT
This more closely recreates what happens outdoors, where basking animals receive heat, visible light and ultraviolet radiation together.
UV Shade
The enclosure should then provide:
stronger UV at basking → moderate UV → partial shade → complete shade → dark crevice
Do not flood every part of the enclosure with strong UVB.
The ability to escape UV exposure is just as important as access to it.
UV Meter
An appropriate UV Index meter is the most reliable way to confirm actual exposure.
Measure at approximately:
the height of the skink’s back while basking.
If You Don’t Own a UV Meter
Many keepers will not initially own one.
Use:
- A reputable linear T5 HO UVB system
- The manufacturer’s current distance guidance
- Correct basking height
- Appropriate mesh guidance
- Plenty of shade
Never guess mounting distance solely from the percentage printed on the lamp.
UVB Replacement
Replace the UVB tube according to the manufacturer’s current guidance.
A UVB lamp can continue producing visible light even when useful ultraviolet output has declined.
Bright Visible Lighting
UVB does not necessarily provide enough visible illumination by itself.
A bright daylight LED can be used alongside the basking and UVB equipment.
Bright daytime illumination supports:
- Circadian rhythm
- Activity
- Basking behaviour
- Exploration
- Natural day/night cues
Photoperiod
Approximately:
11–13 hours of daylight
is suitable through much of the active season.
Seasonal adjustment can be provided.
Night Lighting
The enclosure should become:
dark at night.
Visible red, blue or purple night bulbs are unnecessary.
If supplemental nighttime heat is genuinely required because room temperatures become unsuitable, use a non-light-emitting heat source appropriately controlled.
Humidity
Hosmer’s Skinks generally require relatively dry, well-ventilated conditions.
A useful general exposed ambient range is approximately:
30–50% relative humidity
but the enclosure should contain microclimates rather than maintaining one identical reading everywhere.
Provide a slightly more humid sheltered retreat, particularly useful during shedding.
A realistic gradient might consist of:
dry exposed basking area → moderate ambient conditions → slightly more humid sheltered crevice
Avoid persistently wet or stagnant conditions.
Water
Fresh, clean drinking water should be available continuously.
Provide a stable bowl that cannot easily be tipped over.
Clean and refill it regularly.
Diet
Hosmer’s Skinks are:
omnivorous.
Their diet should contain both appropriate plant material and animal foods.
Healthy adults should receive a substantial plant component rather than being fed as purely insectivorous lizards.
Suitable Greens
Useful options include:
- Dandelion greens
- Endive
- Escarole
- Rocket
- Mustard greens
- Turnip greens
- Other appropriate mixed leafy greens
Vegetables
Suitable additions can include:
- Squash
- Courgette
- Green beans
- Bell pepper
- Small amounts of grated root vegetables
Edible Flowers
Safe pesticide-free options can include:
- Hibiscus
- Dandelion flowers
- Nasturtium
- Rose petals
Invertebrates
Offer a varied rotation including:
- Locusts
- Crickets
- Roaches
- Black soldier fly larvae
- Silkworms
- Mealworms
- Appropriate beetle larvae
- Earthworms from safe sources
- Captive-produced snails
Do not rely upon one feeder species.
Gut Loading
Feeder insects should be properly gut-loaded for approximately:
24–48 hours
before feeding.
Fruit
Suitable fruit can be offered occasionally in small quantities.
Examples include:
- Berries
- Papaya
- Fig
- Mango
Fruit should remain a minor dietary component because of its sugar content.
Vertebrate Foods
Routine rodent feeding is unnecessary.
Rich vertebrate foods should not become dietary staples.
Small quantities of appropriate whole foods or prepared egg may occasionally provide variety, but the normal diet should remain based on appropriate plant foods and invertebrates.
Calcium and Supplementation
Feeder insects should receive appropriate calcium supplementation.
A suitable reptile multivitamin can be used periodically.
Where effective UVB is correctly provided, additional dietary vitamin D3 should generally be used sparingly as part of the overall supplementation programme.
Supplementation should complement a balanced diet rather than compensate for poor husbandry.
Juvenile Feeding
Growing juveniles generally require:
- More frequent meals
- Relatively greater animal protein
- Appropriate plant foods
- Correct calcium supplementation
- Effective UVB
Appropriately sized food can generally be offered daily or near-daily depending on meal size, growth and body condition.
Adult Feeding
Healthy adults can generally receive meals approximately:
3–5 times per week
depending upon:
- Portion size
- Activity
- Season
- Body condition
Plant material may be available more frequently than calorie-dense animal foods.
Body Condition and Obesity
Hosmer’s Skinks can become overweight in captivity.
Monitor:
- Body shape
- Weight
- Activity
Common contributors to obesity include:
- Excess fruit
- Excess fatty insects
- Frequent rich animal foods
- Oversized portions
- Inadequate activity
A strong feeding response does not necessarily mean the animal requires more food.
Social Behaviour
Members of Egernia are notable for relatively complex social behaviour.
Hosmer’s Skinks may form stable social associations.
However:
social species does not mean any two animals will be compatible.
A single animal can be maintained successfully.
Group Housing
Established compatible:
- Pairs
- Related animals
- Family groups
may coexist successfully when provided with appropriate accommodation.
Unfamiliar adults may show:
- Chasing
- Biting
- Territorial conflict
- Resource guarding
- Chronic stress
Group Enclosure Requirements
Provide:
- Substantial additional space
- Multiple basking sites
- Numerous crevices
- Multiple feeding locations
- Visual barriers
- Several warm and cool retreats
No individual should be able to monopolise the only suitable basking site or hide.
Monitoring Groups
Monitor each individual for:
- Weight
- Feeding
- Basking
- Activity
- Injuries
- Retreat use
Warning signs include:
- Persistent chasing
- Constant hiding
- Weight loss
- Bite wounds
- Failure to bask
- Unequal feeding
Always be prepared to separate incompatible animals.
Sexing
Sexing can be difficult, particularly in juveniles.
Mature males may develop broader heads and more robust proportions, but experienced examination may be required for reliable sex determination.
Breeding
Hosmer’s Skinks are:
viviparous — live-bearing.
They do not lay eggs for external incubation.
Embryos develop within the female and young are born fully formed.
Seasonal Cycling
Reproductive activity can be influenced by seasonal changes in:
- Temperature
- Day length
- Feeding
- Activity
Experienced breeders may use carefully managed seasonal cycling.
Pregnancy
A gravid female may:
- Become visibly broader
- Increase basking
- Alter feeding behaviour
- Reduce activity later in pregnancy
Pregnant females require excellent:
- UVB
- Calcium
- Hydration
- Nutrition
Gestation and Birth
Gestation can extend for several months and varies with temperature, seasonal conditions and the individual female.
Hosmer’s Skinks generally produce relatively small numbers of well-developed offspring.
Approximately:
1–4 young
may be produced, although reproductive output varies.
Neonates
Newborn Hosmer’s Skinks are relatively large and well developed.
Young may remain associated with adults within compatible established social groups.
Nevertheless, carefully monitor:
- Feeding
- Growth
- Basking access
- Adult behaviour
Neonate Husbandry
Where young are housed separately, provide:
- Secure accommodation
- Numerous appropriately sized crevices
- Basking heat
- UVB
- Bright daytime lighting
- Fresh water
- Small live prey
- Appropriate plant foods
Suitable UVB should be provided from the beginning.
Growing animals require excellent calcium availability, nutrition and UVB for normal skeletal development.
Quarantine
New animals should undergo quarantine before introduction to established reptiles.
Approximately:
90 days
is a sensible starting point.
During quarantine monitor and record:
- Weight
- Appetite
- Faeces
- Shedding
- Hydration
- Respiration
- Activity
Veterinary faecal screening is worthwhile for newly acquired animals, individuals of uncertain history or animals showing abnormal faeces or weight loss.
Do not introduce a newly acquired animal directly into an established social group.
Shedding
Healthy shedding is supported by:
- Appropriate hydration
- Humidity gradients
- Rough furnishings
- Good nutrition
Check particularly around:
- Toes
- Tail
for retained shed.
Common Health Concerns
Metabolic Bone Disease
Inadequate UVB, calcium or nutrition can contribute to metabolic bone disease.
Possible signs include:
- Weakness
- Tremors
- Limb deformity
- Jaw abnormalities
- Fractures
Obesity
Excess calorie intake and insufficient activity can lead to obesity.
Dehydration
Possible signs include:
- Sunken eyes
- Lethargy
- Reduced appetite
- Poor skin condition
Respiratory Disease
Possible signs include:
- Wheezing
- Clicking
- Nasal discharge
- Excess mucus
- Persistent abnormal open-mouth breathing
Parasites
Possible signs include:
- Weight loss
- Persistent abnormal faeces
- Poor body condition
- Reduced appetite
Social Injuries
Group-housed animals should be checked for:
- Bite wounds
- Damaged toes
- Missing scales
- Tail injuries
Signs of Good Health
A healthy Hosmer’s Skink should generally display:
- Clear, alert eyes
- Strong coordinated movement
- Regular basking
- Active exploration
- Normal retreat behaviour
- Good feeding response
- Healthy skin
- Normal faeces
- Appropriate muscular body condition
When to Seek Veterinary Advice
Consult a suitably experienced reptile veterinarian for:
- Persistent food refusal
- Significant unexplained weight loss
- Severe lethargy
- Weakness
- Tremors
- Limb or jaw abnormalities
- Respiratory symptoms
- Persistent abnormal faeces
- Significant injuries
- Reproductive difficulties
- Any substantial unexplained behavioural change
Common Husbandry Mistakes
Enclosure too small
These are active, long-lived reptiles requiring meaningful environmental choice.
Insufficient rockwork
Secure crevices are fundamental to their natural behaviour.
Only providing large open caves
Include tight-fitting crevice-style retreats.
Unstable rockwork
Heavy structures must be securely supported.
Pulling an animal from a crevice
Never forcibly extract a wedged skink.
Whole enclosure too hot
Always provide a genuine cool zone.
Basking area too cool
Provide an appropriately hot basking surface.
Using a heat mat as the main heat source
Overhead daytime heating is more appropriate.
No UVB
Effective UVB is an important component of long-term husbandry.
Relying on a small compact UVB lamp
A quality linear T5 HO system provides much more useful coverage.
Choosing UVB only by percentage
Actual UVI at the animal matters.
Buying the strongest UVB because the species comes from Australia
More UV is not automatically better.
No UV shade
The animal must be able to escape ultraviolet exposure completely.
Dim daytime enclosure
Provide strong visible daytime illumination.
Feeding only insects
Hosmer’s Skinks are omnivorous.
Too much fruit
Fruit should remain occasional.
Too many rich animal foods
This can contribute to obesity.
Poor gut loading
Feeder nutrition matters.
Assuming social means any animals can live together
Compatibility must be established and monitored.
Only one basking site for several animals
Duplicate important resources.
Provenance and Responsible Acquisition
Hosmer’s Skinks are Australian native reptiles.
Australia maintains strict wildlife export controls, and animals established in overseas collections generally descend from historical captive lineages.
When acquiring one, retain available:
- Breeder details
- Purchase records
- Parentage information
- Transfer records
- Relevant legal documentation
Captive-bred animals from traceable established lines should be preferred.
Always check the current rules governing acquisition, possession, transport, breeding and sale in your jurisdiction.
Responsible Ownership Checklist
Before acquiring a Hosmer’s Skink, ensure you can provide:
- 120 × 60 × 60 cm minimum adult enclosure
- Larger accommodation where possible
- Substantially more space for groups
- Secure rockwork
- Multiple tight crevices
- Stable naturalistic substrate
- 40–45°C basking surface
- 28–32°C warm ambient area
- 22–26°C cool area
- Appropriate nighttime temperature reduction
- Linear T5 HO UVB
- Approximately UVI 3–5 at the basking position
- Complete UV shade
- Bright visible daytime lighting
- Fresh water continuously
- Varied omnivorous diet
- Appropriate leafy plant foods
- Varied gut-loaded invertebrates
- Appropriate calcium and vitamin supplementation
- Careful social monitoring where cohabited
- Long-term reptile veterinary care
- Appropriate provenance records
Husbandry Summary
Adult enclosure: 120 × 60 × 60 cm minimum; larger preferred
Lifestyle: Terrestrial, rock-associated
Basking surface: 40–45°C
Warm ambient: 28–32°C
Cool area: 22–26°C
Night: Approximately 18–22°C
Humidity: Generally 30–50% exposed ambient with more humid sheltered microclimates
Substrate: Naturalistic soil/sand/clay mixture
UVB: Linear T5 HO UVB
Target basking UVI: Approximately 3–5
Visible lighting: Bright daylight illumination strongly recommended
Diet: Omnivorous — appropriate plant material plus varied invertebrates
Water: Available continuously
Handling: Limited; voluntary interaction preferred
Social housing: Compatible established animals may coexist; careful monitoring essential
Reproduction: Live-bearing
Young: Commonly a small number, approximately 1–4
Quarantine: Approximately 90 days as a sensible starting point
Provenance: Retain breeder and acquisition records
UVB — What Do I Actually Need to Buy?
For someone setting up their first Hosmer’s Skink enclosure, the simplest starting point is:
Look for a quality LINEAR T5 HO UVB system.
Do not rely on a small compact UVB bulb as the main source.
Depending upon your enclosure height, mounting method and basking position, a tube broadly within the:
6–12% UVB class
may be appropriate.
But the number printed on the box is not the actual target.
What we want at the animal is approximately:
UVI 3–5 at the skink’s back while it is using the main basking position.
The same UVB lamp can produce very different exposure depending upon how it is installed.
Remember:
Closer lamp = generally more UV
Greater distance = generally less UV
Mesh between lamp and skink = usually less UV
Higher basking rock = skink closer to the lamp
So do not think:
“12% must be better than 6%.”
Think:
“Which lamp and installation will provide UVI 3–5 at my basking position?”
If you are buying equipment at an expo or reptile shop and are unsure, ask for:
“A linear T5 HO UVB system for a day-active Australian basking skink. I need approximately UVI 3–5 at the basking position.”
Then use the manufacturer’s current distance guidance for the exact system you purchase.
Your main basking site should combine:
HEAT + UVB + BRIGHT VISIBLE LIGHT
and the enclosure should then transition through:
lower UV → partial shade → complete shade → dark crevice.
Remember what the different equipment does:
Basking lamp = HEAT
T5 HO UVB tube = ULTRAVIOLET
Daylight LED = BRIGHT VISIBLE LIGHT
These perform different jobs.
The aim is not the strongest UVB lamp available.
The aim is the correct UV exposure at the basking site while allowing the skink to move into complete shade whenever it chooses.
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. For Australian native species maintained outside Australia, retain appropriate provenance and acquisition records.
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