Horned Lizards of various species, usually sold as “Horned Toads”, were US pet trade staples in the 1950’s and 60’s. Looking much like minute dinosaurs, they needed more heat and UVB than most could provide, along with an ant-dominated diet, and fared poorly. As a boy, I was able to keep them going in the summer, thanks to natural sunlight and plentiful ants, but they declined in winter (I discovered they did not like the “house ants” I collected in local stores!). As I moved into zoo work, the key to keeping most species remained elusive. So I was very happy to hear that the Los Angeles Zoo had recently (January, 2011) succeeded in breeding the largest species, the Giant Horned Lizard, Phrynosoma asio. Read More »
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In Part I of this article we discussed the care of the Tropical Girdled Lizard (Cordylus tropidosternum), one of the most commonly available of the 37 interesting species in the genus Cordylus (among the Girdled Lizard’s relatives is the much sought-after Armadillo Lizard, C. cataphractus, see photo). Also known as the East African Spiny-tailed Lizard, its unique appearance and behaviors are quite captivating. Today we’ll cover captive reproduction in more detail.
Temperature Fluctuations in Nature and Captivity
In their native South Africa, Tropical Girdled Lizards hibernate during the winter, and a cooling off period was believed necessary to induce captive reproduction. Good results are usually achieved after captives have been held at temperatures of 58-60 F for 4-6 weeks. During this time they move about a bit, and drink, but do not feed.
However, I’ve recently received reports of captive births (females bear 1-4 large, well-developed youngsters) among lizards subjected to little if any change in temperature. In some situations, normal seasonal fluctuations in the temperature of the room in which the lizards are held seems to be enough to stimulate reproduction.
Reproduction Without a Traditional “Winter”
In the most recent breeding of which I’ve been informed, births occurred in a terrarium maintained at an ambient of 77 F with a basking site of 95 F. The room in which the terrarium was located was heated during the winter and air conditioned during the summer, which may have “switched seasons” on the lizards, but they bred none-the-less.
In another situation, the terrarium was in a room maintained at approximately 75 F year-round, but, being near a window, may have been subjected to the effects of outdoor temperatures.
Caring for Youngsters – UVB Light
Tropical Girdled Lizards seem to form loosely connected colonies in the wild; captives usually fare well in groups, but dominant individuals sometimes prevent others from feeding and basking.
Young lizards should have access to UVB light. However, they are quite shy, and may not bask often, especially if adults are present. Also, they tend not to climb to the top of rock piles and such when basking, preferring to remain at or close to the terrarium’s floor – at which point they may be too far from the bulb to obtain adequate UVB exposure. Therefore, newborns are best removed to shallow enclosures, in order to maximize UVB exposure (they should be able to bask within 6-12 inches of florescent UVB bulbs).
Useful UVB and UVA Lamps (Bulbs)
A Zoo Med 10.0 UVB bulb positioned within 6 to 8 inches of the basking site, is ideal. Mercury vapor bulbs can be used in situations where the basking site cannot be positioned within 12 inches of the bulb.
A source of UVA light, while perhaps not critical for survival, will help to encourage natural behaviors and reproduction.
Recently I have helped to set up new reptile and amphibian exhibit areas for The Maritime Aquarium in Norwalk, CT (long known for its excellent collection of native marine life), and was happy to learn that Girdled Lizards have reproduced there (off exhibit).
A listing of all 37 Cordylus species, along with range and other information, is posted here.
While the role of UVB light in reptile care is well-understood, we know less about UVA. For some thoughts and observations, please see Providing UVA to Reptiles and Amphibians.
Armadillo Girdle tailed Lizard image referenced from wikipedia and originally posted by Ltshears from flickr and Frank Wouters
The Tropical Girdled Lizard (Cordylus tropidosternum) is the most readily available of the 30+ Cordylus species, and offers an excellent introduction to the group. It is sometimes sold as the “Armadillo Lizard”, confusing purchasers who had in mind another (and, at $1,200+ each, vastly more expensive!) species with the same common name, C. cataphractus. It also occasionally appears under the name “East African Spiny-tailed Lizard”.
Tropical Girdled Lizards in Captivity
Don’t let their inexpensive price tag mislead you – Tropical GirdledLlizards are no less interesting in appearance or behavior than their pricey cousins. In fact, the “true” Armadillo Lizard, C. cataphractus, which is no longer exported from South Africa, is one of the shyest reptiles I’ve ever encountered.
When kept properly, these southeast African natives may reward you by reproducing, always a thrill for responsible herp keepers (judging from the size of the young, the event is less thrilling for the moms – please see below!). While not bold, they are no as retiring as most related species, and are relatively easy to observe.
Girdled Lizards give birth to 1-4 huge live youngsters. The hatchling pictured here, born at the Maritime Aquarium in Connecticut, is one of a litter of 2 – their total mass seemed to be nearly half that of their mother.
Two subspecies of tropical Girdled Lizards appear in the pet trade; to help determine which you have, and for a key to other species in the genus, please see this reference.
Over the last several years I have helped to set up new reptile and amphibian exhibit areas for The Maritime Aquarium in Norwalk, CT (long known for its excellent collection of native marine life). To learn more, please click here.