In company with reptiles since 1993!

BION Events Giant horned lizard (Phrynosoma asio)

Giant horned lizard (Phrynosoma asio)

Breeding of Phrynosoma asio at BION Terrarium Center

We keep Phrynosoma asio in BION Terrarium Center since 2011 and start to breed them  in 2013. We strongly  believe that this unusual and still rare species should take soon the important place in herpetoculture (expecially for desert lizards enthusiasts) together with Uromastyx, Xenagama, Petrosaurus, Ctenosaura, Crotaphytus, Pogona , etc.

We imported the first breeding group from Mexico in 2011; the second group was imported from Switzerland in 2012. For October 2014, we have 6 adult males, 12 adult females and 12 c.b. babies.

The details of keeping

Terrarium: We keep adult lizards in groups (2:4) in horizontal type terrariums 160x60x50 cm. Substrate: thick layer of fine sand (depth from 3 to 12 cm).   The bottom’s lay should be kept humid.

Babies and young lizards are kept in open plastic boxes  60x40x40 cm. Substrate: paper towels or wipes.

Decoration & equipment: Water bowls, branches and wood for climbing & hiding, artificial plants

Lighting (day length): Zoo Med lamp “Reptisun UV.10”;  14 hours at summer, around 4 hours at wintertime (during hibernation) .  

Heating: Spot lamp 100 watts;

UV: Full spectrum Zoo Med lamp “Reptisun UV.10”;

Temperature: day time - 28-30°Cnight time - 15-22°C.

basking place – up to 45°C

IMPORTANT: We try to keep in hot summer time all our Phrynosoma in outdoor facilities.

Humidity: For adults - spray intensively terrarium every  other day before feeding at 3:00 p.m.

For babies – spray box every day 1-2 times (the first time at the morning and the second time before feeding at 3:00 p.m.)

Fresh water is available all  time.

Diet: Crickets, Turkestan roaches, ants (must be in the summer) – every day by 5-7 insects per animal. Do not give hard shell mealworms and zophobas (only freshly molt with white color).  

It is better to feed animals from 3:00 to 4:00 p.m. after lizards are well heated.

We spray intensively terrarium with water before feeding.

Mineral supplements: Each feeding we sprinkle insects with calcium andvitamins Also we using Repashi Superfood (Formic Cal Plus)  2 times per week when feeding  other insects than ants


Veterinary issues:

Rickets (deformation and softening of the bones) may develop in juveniles and adults in case of wrong care. 

To prevent problem - the exposure of UV should be increased (“hard” UV over than 280nm during 2 minutes every other day until improvement).

Also dose of calcium should be increased (calcium gluconate in liquid should be offered oraly by 2-3 drops from 2 ml syringe every other day until the situation improves.


1.. http://zoofacts.ru/yashherica-ili-zhaba-frinozoma/

2.. http://vivanatura.org/Phrynosoma%20asio.html

3.. http://www.phrynosoma.org/asio.html

4.. map https://www.iucnredlist.org/species/198393/2524363