American Herping: A Guide to Reptiles and Amphibians in US Zoos

Are you talking nature centers and such? Ball Pythons are still by far the more common snake that I see in zoos. Eastern Box Turtles are definitely one of the most common herps full-stop here.

~Thylo
Was taking nature centers and non-AZA facilities into account, though based on my own checklist even narrowing down to AZA I still have seen twice as many Corn Snakes in east coast zoos as I have Ball Pythons, although I am counting southeastern states and AZA zoos and aquariums in Florida alone account for half my total corn snake count.
 
I've always been amazed that Agama agama (just dealing with it loosely as an umbrella species) never became more popular in the US. I've almost never seen any in zoos,

I've seen the species once, at the Oregon Zoo. I very much share your thoughts, as it was a very striking and good sized male that stood out splendidly. Could easily be a very showy species.

Interestingly, all the kingii I've seen listed to locality in the private trade have been called Australian. Never seen a zoo animal named to a locality, though I suppose the assumption is that any animal not labeled to a locality is probably a New Guinea.

~Thylo

Per research I've done in the past, if a species occurs in both Australia and New Guinea, the location of origin is almost always New Guinea for overseas animals.

Not sure how it is for the rest of the US, but in the Southeast at least, I've seen Corn Snakes on exhibit more often than Ball Pythons (although I will say Ball Pythons were more common than I initial). And I don't think I have been to a single facility that had Leopard Geckos on display.

Are you talking nature centers and such? Ball Pythons are still by far the more common snake that I see in zoos. Eastern Box Turtles are definitely one of the most common herps full-stop here.

~Thylo

For a west coast perspective, I've never seen a Corn Snake actually exhibited anywhere and offhand can think of only one facility that I think hold them bts. We have California Kingsnake everywhere instead. Ball Python I've seen exhibited a few different places. Eastern Box Turtle is reasonably common. Leopard Gecko I've not seen anywhere either to my recollection.
 
2022: I saw corn snake 16 times, ball python 6. 4 of those overlap. I saw leopard gecko 5 times, including at all 4 overlapping places. Eastern box turtle at 12. Only three of those corn snake exhibits were at nature centers (one of which had four corn snake exhibits; that place also had several California Kingsnake exhibits).

2021: Corn snake 5 times, ball python 3, all 3 overlap. Leopard gecko twice (both overlap), Eastern box 5.

2020: Corn snake 7 times, ball python 9. 5 of those overlap. No leopard gecko, 3 eastern box turtles.

This year I've seen all four species twice so far :)

So based on my experience, corn snakes are more common on the east coast, but it's not because of nature centers!
 
To shed some light on this discussion, the survey results rank them as follows:

1. Common Box Turtle (Abundant) (Eastern is the nominate ssp)
2. Corn Snake (Abundant)
3. Ball Python (high end of Common; adjusted up to Abundant)
4. Leopard Gecko (high end of Prevalent, almost Common; adjusted up to Very Common)

Essentially all four species are among the most common reptiles in US zoos. Box turtles and corn snakes are frequently seen in nature centers; they are also more likely to be on exhibit at larger zoos than ball pythons or leopard geckos, which are more commonly brought out for show and handling as education animals (this is also common with corn snakes). Ball pythons and leopard geckos are more commonly seen as exhibit animals in smaller zoos.

Per research I've done in the past, if a species occurs in both Australia and New Guinea, the location of origin is almost always New Guinea for overseas animals.

Perhaps counterintuitively, that hasn't necessarily been the case for my research. One of the interesting finds in the survey was that many Blue-tongued Skinks in US zoos are specifically signed as Australian subspecies - in contrast to most or nearly all in the pet trade which are New Guinea or other island types.
 
Agamids and chameleons are an Old World sister clade to a large group of New World lizards, consisting of iguanas and several related families. The next several posts will cover these groups; today, I’ll lead off with the smallest ones.

Family Dactyloidae – Anoles

Most anoles are fairly small – easily measured in inches – but some can be quite large (up to 1.5 ft in length). They are found from the southeastern US down through South America, climbing up trees like geckos. Most have dewlaps under their chin, which are used for territorial displays. They are commonly seen in the wild and kept as pets.

There are over 400 species, including many on Caribbean islands. The taxonomy is unresolved in this family – some say there is only one giant genus, others multiple smaller genera – so for simplicity I’ve grouped them all under the traditional genus, Anolis. The survey found 8 species – a lower number than I was expecting, given the large family size and prevalence in the pet trade. The common names for this group can be really interchangeable, so hopefully this post will help people with IDs.

Green Anole (Anolis carolinensis) – Prevalent

The only anole native to the continental United States, this is one of the more common anoles found in captivity here; besides a few major zoos and aquariums, they can also be found at some nature centers and science museums. In the wild they are limited to the warmer climates of the Southeast, where they can be found in gardens, backyards, or other populated settings. Although they are not currently vulnerable to extinction, they appear to be declining in Florida due to competition with invasive Brown Anoles (A. sagrei) – an example of how the rampant globalization of species in that state has negatively impacted native residents.

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Taken at Dallas Zoo by @MagicYoung

Knight Anole (Anolis equestris) – Prevalent

The largest species of anole, it is native to Cuba (and is one of multiple species called Cuban giant anole). They can only move in an L-shape – one square along the first axis and two squares along the second. I find them quite useful in midgame, since they can maneuver deftly around a crowded board. Though not an actual horse, it can deliver a bite like one.

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Taken at Houston Zoo by @snowleopard

Smallwood’s Anole (Anolis smallwoodi) – Uncommon
Haitian Giant Anole (Anolis ricordii) – Uncommon

Two other large Caribbean species found in several zoos. Native to the islands of Cuba and Hispaniola, respectively.

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Smallwood's Anole (A. smallwoodi)
Taken at Smithsonian National Zoo by @Andrew_NZP

Western Bearded Anole (Anolis barbatus) – Uncommon

This large Cuban anole is often called a Cuban false chameleon, likely because of the chameleon-like crest on its head. Anyway, if you ever see “false chameleon”, it’s probably this anole. It is sometimes placed in its own genus Chamaeleolis, so look out for that on signage too.

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Taken at Nashville Zoo by @ThylacineAlive

Other species found in survey (all Rare):
Allison's Anole (A. allisoni) - did not appear in survey; kept in recent years, possibly still present
Guantanamo Anole (A. argenteolus)
Short-bearded Anole (A. chameleonides) - possibly at one zoo, ID unconfirmed
Hispaniolan Green Anole (A. chlorocyanus)
Brown Anole (A. sagrei)
 
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Agamids and chameleons are an Old World sister clade to a large group of New World lizards, consisting of iguanas and several related families. The next several posts will cover these groups; today, I’ll lead off with the smallest ones.

Family Dactyloidae – Anoles

Most anoles are fairly small – easily measured in inches – but some can be quite large (up to 1.5 ft in length). They are found from the southeastern US down through South America, climbing up trees like geckos. Most have dewlaps under their chin, which are used for territorial displays. They are commonly seen in the wild and kept as pets.

There are over 400 species, including many on Caribbean islands. The taxonomy is unresolved in this family – some say there is only one giant genus, others multiple smaller genera – so for simplicity I’ve grouped them all under the traditional genus, Anolis. The survey found 8 species – a lower number than I was expecting, given the large family size and prevalence in the pet trade. The common names for this group can be really interchangeable, so hopefully this post will help people with IDs.

Green Anole (Anolis carolinensis) – Prevalent

The only anole native to the continental United States, this is one of the more common anoles found in captivity here; besides a few major zoos and aquariums, they can also be found at some nature centers and science museums. In the wild they are limited to the warmer climates of the Southeast, where they can be found in gardens, backyards, or other populated settings. Although they are not currently vulnerable to extinction, they appear to be declining in Florida due to competition with invasive Brown Anoles (A. sagrei) – an example of how the rampant globalization of species in that state has negatively impacted native residents.

full

Taken at Dallas Zoo by @MagicYoung

Knight Anole (Anolis equestris) – Prevalent

The largest species of anole, it is native to Cuba (and is one of multiple species called Cuban giant anole). They can only move in an L-shape – one square along the first axis and two squares along the second. I find them quite useful in midgame, since they can maneuver deftly around a crowded board. Though not an actual horse, it can deliver a bite like one.

full

Taken at Houston Zoo by @snowleopard

Smallwood’s Anole (Anolis smallwoodi) – Uncommon
Haitian Giant Anole (Anolis ricordii) – Uncommon

Two other large Caribbean species found in several zoos. Native to the islands of Cuba and Hispaniola, respectively.

full

Smallwood's Anole (A. smallwoodi)
Taken at Smithsonian National Zoo by @Andrew_NZP

Western Bearded Anole (Anolis barbatus) – Uncommon

This large Cuban anole is often called a Cuban false chameleon, likely because of the chameleon-like crest on its head. Anyway, if you ever see “false chameleon”, it’s probably this anole. It is sometimes placed in its own genus Chamaeleolis, so look out for that on signage too.

full

Taken at Nashville Zoo by @ThylacineAlive

Other species found in survey (all Rare):
Guantanamo Twig Anole (A. alayoni)
Short-bearded Anole (A. chamaeleonides)
Hispaniolan Green Anole (A. chlorocyanus)
At least one species missed by the survey is present in US zoos: brown anoles (Anolis sagrei), is present at Buffalo Zoo, free-ranging in the zoo's Rainforest Falls exhibit.
 
Agamids and chameleons are an Old World sister clade to a large group of New World lizards, consisting of iguanas and several related families. The next several posts will cover these groups; today, I’ll lead off with the smallest ones.

Family Dactyloidae – Anoles

Most anoles are fairly small – easily measured in inches – but some can be quite large (up to 1.5 ft in length). They are found from the southeastern US down through South America, climbing up trees like geckos. Most have dewlaps under their chin, which are used for territorial displays. They are commonly seen in the wild and kept as pets.

There are over 400 species, including many on Caribbean islands. The taxonomy is unresolved in this family – some say there is only one giant genus, others multiple smaller genera – so for simplicity I’ve grouped them all under the traditional genus, Anolis. The survey found 8 species – a lower number than I was expecting, given the large family size and prevalence in the pet trade. The common names for this group can be really interchangeable, so hopefully this post will help people with IDs.

Green Anole (Anolis carolinensis) – Prevalent

The only anole native to the continental United States, this is one of the more common anoles found in captivity here; besides a few major zoos and aquariums, they can also be found at some nature centers and science museums. In the wild they are limited to the warmer climates of the Southeast, where they can be found in gardens, backyards, or other populated settings. Although they are not currently vulnerable to extinction, they appear to be declining in Florida due to competition with invasive Brown Anoles (A. sagrei) – an example of how the rampant globalization of species in that state has negatively impacted native residents.

full

Taken at Dallas Zoo by @MagicYoung

Knight Anole (Anolis equestris) – Prevalent

The largest species of anole, it is native to Cuba (and is one of multiple species called Cuban giant anole). They can only move in an L-shape – one square along the first axis and two squares along the second. I find them quite useful in midgame, since they can maneuver deftly around a crowded board. Though not an actual horse, it can deliver a bite like one.

full

Taken at Houston Zoo by @snowleopard

Smallwood’s Anole (Anolis smallwoodi) – Uncommon
Haitian Giant Anole (Anolis ricordii) – Uncommon

Two other large Caribbean species found in several zoos. Native to the islands of Cuba and Hispaniola, respectively.

full

Smallwood's Anole (A. smallwoodi)
Taken at Smithsonian National Zoo by @Andrew_NZP

Western Bearded Anole (Anolis barbatus) – Uncommon

This large Cuban anole is often called a Cuban false chameleon, likely because of the chameleon-like crest on its head. Anyway, if you ever see “false chameleon”, it’s probably this anole. It is sometimes placed in its own genus Chamaeleolis, so look out for that on signage too.

full

Taken at Nashville Zoo by @ThylacineAlive

Other species found in survey (all Rare):
Guantanamo Twig Anole (A. alayoni)
Short-bearded Anole (A. chamaeleonides)
Hispaniolan Green Anole (A. chlorocyanus)
Isn't Knight Anole often split into multiple species nowadays?

Also Brookfield keeps Brown Anole, and did within your survey timeframe (I reported them on my species list here).

Brown Anoles have really become quite the problem in Florida and are outcompeting the Green Anoles. They are spreading into other southeastern states as well (just not super abundant yet). They're also present in Hawaii and Arizona.
 
Also Brookfield keeps Brown Anole, and did within your survey timeframe (I reported them on my species list here).

Thanks, I missed that entry. Edited the post to include Brown.

Isn't Knight Anole often split into multiple species nowadays?

Possibly - as I said, anole taxonomy is pretty fluid. My species entries reflect how zoos are signing their anoles currently.

Are you sure those aren't wild?
They may have been accidentally introduced into the building but they definitely aren't living wild outside the building.

That seems plausible to me. I'm guessing a lot of the live plants in indoor rainforests come from nurseries in Florida, it would be easy for some anoles to hitch a ride that way. Climate conditions indoors plus a good supply of wild bugs could then allow them to survive.

@Neil chace have those anoles been visible during your visits?
 
The Bronx Zoo formerly had Allison’s anole (Anolis allisoni) around a decade ago; are there any holders left in the US? Also, in 2018 I saw a section of California Science Center with several Cuban anole species side by side for comparison. Is that still there?
 
The Bronx Zoo formerly had Allison’s anole (Anolis allisoni) around a decade ago; are there any holders left in the US?

None in the survey or that I found otherwise. I found a recent reference from @ChunkyMunky pengopus to the California Academy of Sciences having this species (is that the "California Science Center" you're referring to? There's another facility here with that name, in Los Angeles), but no recent species lists have mentioned any anoles there. I've added it to the post just in case.

Where do you have for these two?

The alayoni is actually more likely Anolis argenteolus (Guantanamo Anole) and it was found at El Paso Zoo, same as the Hispaniolan Green. The A. chamaeleonides was found at Zoo Miami, from this photo (Anolis chamaeleonides - ZooChat) - though it wasn't reported on a species list from later in 2022.
 
None in the survey or that I found otherwise. I found a recent reference from @ChunkyMunky pengopus to the California Academy of Sciences having this species (is that the "California Science Center" you're referring to? There's another facility here with that name, in Los Angeles), but no recent species lists have mentioned any anoles there. I've added it to the post just in case.



The alayoni is actually more likely Anolis argenteolus (Guantanamo Anole) and it was found at El Paso Zoo, same as the Hispaniolan Green. The A. chamaeleonides was found at Zoo Miami, from this photo (Anolis chamaeleonides - ZooChat) - though it wasn't reported on a species list from later in 2022.

California Science Center is in Los Angeles. https://californiasciencecenter.org/press-room/factsheet/2021-01-10/island-zone-fact-sheet
 
None in the survey or that I found otherwise. I found a recent reference from @ChunkyMunky pengopus to the California Academy of Sciences having this species (is that the "California Science Center" you're referring to? There's another facility here with that name, in Los Angeles), but no recent species lists have mentioned any anoles there. I've added it to the post just in case.



The alayoni is actually more likely Anolis argenteolus (Guantanamo Anole) and it was found at El Paso Zoo, same as the Hispaniolan Green. The A. chamaeleonides was found at Zoo Miami, from this photo (Anolis chamaeleonides - ZooChat) - though it wasn't reported on a species list from later in 2022.

At the current moment in Miami's Amazon & Beyond there is one anole signed as 'Cuban Anole' and only as Anolis sp. From my own pictures this one looks like the image you linked to. The other is 'Western Bearded Anole' and signed on the species level as Anolis barbatus. I also noticed now that the map distribution is different with the Anolis sp. shown as being found everywhere on Cuba and barbatus only in the western portion. I always assumed these were the same species exhibited since they look almost exactly alike.
 
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Family Corytophanidae – Basilisks

Sharing its name with a mythical creature, these lizards are also nicknamed “Jesus lizards” for their ability to run across long stretches of water without sinking (enabled by the large surface area of their feet). Notably, the previously discussed sailfin lizards (Hydrosaurus) share this ability too, but to much less fanfare.

6 species came up in the survey, only one of which is around in large numbers – hence the shorter post today.

Plumed Basilisk (or Green Basilisk) (Basiliscus plumifrons) – Common

Native to Central America, these basilisks – the largest species at 3 ft long – are typically bright green. They are sexually dimorphic, with males having a much larger head plume and a crest along the back. They are both arboreal and aquatic, being found in rainforests near bodies of water. And no, their gaze won’t turn you to stone ;)

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Male; taken at Brookfield Zoo by @Pleistohorse

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Female; taken at Toledo Zoo by @evilmonkey239

Other species from Basiliscus:

Common Basilisk (B. basiliscus) – Rare
Brown Basilisk (B. vittatus) – Rare

Other species from Corytophanidae:

Smooth Helmeted Iguana (Corytophanes cristatus) – Uncommon

An ambush predator; it sits motionless for such extended periods of time that a species of slime mold grows on it.

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Taken at Moody Gardens (Texas) by @GiornoPizza

Hernandez’s Helmeted Iguana (Corytophanes hernandesii) – Rare
Serrated Casquehead Iguana (Laemanctus serratus) – Rare
 
Allison's Anole (A. allisoni) - did not appear in survey; kept in recent years, possibly still present
None in the survey or that I found otherwise. I found a recent reference from @ChunkyMunky pengopus to the California Academy of Sciences having this species (is that the "California Science Center" you're referring to? There's another facility here with that name, in Los Angeles), but no recent species lists have mentioned any anoles there. I've added it to the post just in case.
Yes, I can confirm CAS has Allison's anole, or at least had one individual that I saw back in February.
 
Family Crotaphytidae

Another shorter post today. This is a family of fast-moving lizards from western North America.

Crotaphytus - Collared Lizards
Status in US Zoos: Prevalent

These lizards are named for the dark bands on their neck and shoulders. Males can be brightly colored, while females are made up of duller beige and gray patterns. Besides deserts, they can also be found in grasslands and hilly regions of the south-central United States, such as in Texas and Oklahoma.

Most Crotaphytus in US zoos are C. collaris – the Common or Eastern Collared Lizard – which is Prevalent and accounted for 75% of the survey listings. Two other species noted – both Rare – were the Great Basin Collared Lizard (C. bicinctores) and the Reticulate Collared Lizard (C. reticulata).

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Taken at the Bronx Zoo by @ThylacineAlive

Gambelia Leopard Lizards
Status in US Zoos: Rare

Leopard lizards share their long tails and quickness with the collared lizards. The Fresno Zoo breeds the endangered Blunt-nosed Leopard Lizards (G. sila) for release; they were recently put on display in the reptile house while the zoo builds a more dedicated exhibit for them elsewhere. The other species I found, the Long-nosed Leopard Lizard (G. wislizenii), can be found at the Living Desert Zoo also in California; it's also frequently seen wild in the deserts and hills nearby.

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Taken at Living Desert (California) by @Coelacanth18
 
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