Order Squamata
Part I: Lizards
The survey found ~235 species of lizards in US collections. “Lizards” are not an actual taxonomic group, as snakes and lizards are closely related – in fact, some lizards are more closely related to snakes than to other lizards. Nevertheless, it is easy to tell a legged animal from a legless animal so we’ll stick with the usual branding.
Family Anguidae – Alligator Lizards and Legless Lizards
PSYCH. Gonna start off by throwing everyone for a loop – not all lizards have legs! Called glass lizards or slow worms, these animals offer zoos a great educational opportunity to show how lizards and snakes aren’t as different as people think.
Legless Lizards
European Glass Lizard/Sheltopusik (Pseudopus apodus) – Very Common
Despite the fact that we have native legless lizards here in the States, a European species is by far more common in zoos. Also common in the pet trade, the sheltopusik (also spelled scheltopusik, which I
think is technically the correct German spelling) is held by big and small zoos alike; they are popular as an ambassador/education animal.
Taken at San Diego Zoo by
@NigeW
Meanwhile, overall native glass lizards are
Uncommon. The survey found the following two species, which are also by far the most commonly seen in the wild here:
Slender Glass Lizard (Ophisaurus attenuatus)
Eastern Glass Lizard (Ophisaurus ventralis)
Alligator Lizards
Okay, we’ll move on to lizards that actually have legs. Alligator lizards are the transition here, as they look rather like glass lizards but with legs attached.
Elgaria and
Gerrhonotus
Status in US Zoos:
Uncommon
Although wild alligator lizards are fairly common in the Southwest (I’ve seen them on a number of occasions), our native species are not commonly kept in zoos. Almost every holding I found was west of the Mississippi River where they are found naturally, and are especially prevalent in nature centers and local desert-focused facilities.
Species in the survey:
Texas Alligator Lizard (Gerrhonotus infernalis)
Northern Alligator Lizard (Elgaria coerulea)
Madrean Alligator Lizard (Elgaria kingii)
Southern Alligator Lizard (Elgaria multicarinata)
Southern Alligator Lizard (Elgaria multicarinata)
Taken in the wild by
@Great Argus
Abronia
Status in US Zoos:
Prevalent
A genus of arboreal alligator lizards, commonly found in bromeliads throughout the forest canopies of Mexico and Central America. Most of the ones in zoos are the
Mexican Alligator Lizard (A. graminea), an endangered species found in a sliver of Mexican montane forest. Although habitat loss is the main cause of their decline, illegal trafficking for the pet trade has also contributed.
Mexican Alligator Lizard (A. graminea)
Taken at Zoo Atlanta by
@DannySG
Other species:
Bromeliad Arboreal Alligator Lizard (A. taeniata) – Rare
Family Diploglossidae – Galliwasps
Closely related to the anguids, these lizards are mostly found on the Caribbean island of Hispaniola. There is one species I found in American zoos:
Haitian Giant Galliwasp (Caribicus warreni, formerly Celestes warreni) – Uncommon
Only found in a handful of zoos, this endangered galliwasp (assigned a new genus in 2021) hails from the jungles of Haiti and the Dominican Republic. It is threatened by habitat loss and the illegal pet trade. The Nashville Zoo has kept a breeding colony of these lizards for several years; they are also inexplicably found in a few Texas facilities.
Taken at Nashville Zoo by
@Coelacanth18