ments, from central arid regions through to coastal
eucalypt forests and alpine woodlands. As such,
their captive requirements vary based on their
natural habitats and climate. For the purpose of this
article, the information presented will be primarily
directed towards the husbandry of the Common or
Eastern Blue-tongue, as this species is generally
the most suitable for new reptile keepers, and is
readily available. Much of the information is relevant
to multiple species, however temperature and
humidity requirements can differ significantly.
Blue-tongues are generally long-lived in captivity
and can easily reach 10-15 years of age, with some
specimens having a lifespan of more than 20 years.
Gender can be difficult to identify to the untrained
eye, and it is nearly impossible to determine the sex
of juveniles. An experienced keeper may be able to
distinguish gender visually by looking for differences
in head shape and body proportions as well as
other anatomical features. Adult blue-tongues can
also be probed or (in the case of males) have their
hemipenes everted, however these techniques
should only be attempted by an experienced keeper
or veterinarian.
design to provide a more natural and stimulating
environment.
It is important to maintain high standards of
cleanliness and hygiene within the blue tongue’s
enclosure. Daily ‘spot checks’ should be carried out
to remove any faeces, shed skin or uneaten food. A
full substrate change should be undertaken every
six to eight weeks (maybe more frequently depend-
ing on the type of substrate used) and the enclosure
thoroughly cleaned with a reptile-safe disinfectant.
Housing.
Blue-tongues are slow-moving, terrestrial skinks,
and in their natural environment spend the majority
of their time living amongst fallen timber, leaf litter,
vegetation and in rocky crevices. Therefore, in
captivity enclosures that are longer than they are tall
are important to allow these lizards plenty of floor
space to engage in natural foraging and basking
behaviours. Like many other reptiles, blue-tongues
are considered solitary creatures and are generally
best housed on their own. Having more than one
blue-tongue in an enclosure may lead to issues
associated with dominance and aggression. Heating and lighting.
The provision of suitable temperature gradients
within the enclosure is essential for a blue-tongue’s
health and wellbeing. Being a coastal species,
Eastern Blue-tongues require slightly cooler
temperatures than their inland cousins, with a
basking spot of between 30-33˚C being appropriate.
The lizards should have access to a slightly
elevated piece of flat timber or rock to allow them to
bask closer to the heat source - keep in mind they
are not great climbers. Ambient temperatures
should be maintained with a gradient of 24-28˚C
and should not drop below 18-21˚C at night.
Timber or glass reptile enclosures are the ideal
housing option for blue-tongues and should be no
smaller than 90cm x 45cm x 45cm for one adult
lizard. Enclosures measuring 120cm x 60cm x 60cm
will provide the animal with a larger surface area in
which to explore and remain active. It is important
that there is sufficient ventilation, as well as a
secure, lockable door. Many keepers also success-
fully house blue-tongues in outdoor enclosures and
lizard pits. Temperatures should be checked daily and
regulated with the use of a high-quality thermostat.
Recommended heat sources include incandescent,
halogen and ceramic (night time only) globes
coupled with a good-quality heat mat as a secon-
dary source of under-floor heating.
Essential furnishings include a number of hides
placed at both the hot (basking) and cool ends of
the enclosure, a small water bowl and a suitable
substrate. A number of substrates can be used for
blue-t ongues including coconut fiber, aspen,
newspaper and synthetic grass mats. Coconut fiber
makes a practical and aesthetically-pleasing choice,
as it is cheap and highly absorbent. If applied to a
reasonable depth in the enclosure, it will also allow
the lizard to dig and bury itself. Artificial plants and
timber logs can be incorporated into the enclosure
Ultraviolet light (UV) plays an important role in a
blue-tongue’s growth and development. A 5.0-10.0
UVB tube or compact globe can be used as an
adequate source of artificial UV lighting in the
lizard’s enclosure. Blue-tongues also benefit from
access to unfiltered, natural light at least once or
twice a week. They require a day and night cycle
with heat and UV lights running for approximately
12 hours each day, set on a timer.
Nutrition.
Blue-tongued lizards are omnivorous and feed on a
range of plant matter as well as live insects in the
wild. In captivity, they are by no means fussy eaters
and will consume almost anything offered. A good
Image by Michael Cermak.