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The Green Anole (Anolis carolinensis carolinensis) in the Wild and Captivity – Care in Captivity – Part 3

Hello, Frank Indiviglio here.  Please see Part I and Part II of this article for further information on Green Anole care. For Green Anole Natural History, Check out here

Social Grouping

Keeping Several Males Together

Male anoles usually establish territories of at least 4 ft x 4 ft x 4 ft in captivity, so “one male only” is the rule in most home situations.   However, establishing 2 males in a suitably large enclosure is a worthwhile undertaking if at all possible.  If enough space is provided so that each can establish a territory, the males will display vigorously but will largely avoid physical contact (if crowded, the dominant animal will attack the other).  The presence of a competitor for female attentions may spur the males to breed as well. 

 

Be sure to keep at least 3-4 females per male when attempting multi-male exhibits, as their presence may divert attention from aggressive displays and combat.  Another key to success lies in providing a complex environment filled with escape routes and sight barriers.  Vines, hanging plants and inter-twined branches will go a long way in increasing the effective size of your enclosure.

The Value of Smaller Pets and Zoo Animals

Observing anoles in colony-type situations will provide you with insights not possible in single-animal terrariums.  I have always preferred to keep smaller animals that could be well-provided for in captivity, as it is from these that we can truly get a feel for how life is conducted in the wild.  

In a zoo or at home, one can more easily provide a “complete environment” for an anole than for an alligator.   Surrounded by creatures from all over the world during my years working for the Bronx Zoo, it was to those creatures most able to carry out a full range of behaviors that I was drawn.  I learned far more sitting in a greenhouse watching a colony of nearly “free-living” green anoles than I did in  front of multi-million dollar exhibits that, for all their good qualities, provided rhinos, bears, gorillas and other large mammals only a minimal replication of their wild habitats.

Female Dominance

Female green anoles will also establish a dominance hierarchy, based largely upon size. Those at the top may inhibit others from feeding and basking, so be sure to offer numerous basking and feeding opportunities and sight barriers.

 

Immature males are difficult to distinguish from females.  Watch smaller animals as they mature and remove any males, as these will be attacked by the adult male (please see Part I of this article for tips on distinguishing the sexes).

Compatible Species

Anoles, if given enough room, are ideally suited for community terrariums.  In the wild, they dwell in “edge habitats” (areas where 2 distinct habitat types meet) such as meadow-forest borders, and in the ecologically similar overgrown fields and gardens.  Habitat borders and edges usually support a greater variety of animals than do the interiors of either associated habitat. 

The moderate temperatures and humidity levels favored by green anoles are suitable for a wide range of other interesting creatures.  It is often difficult to house amphibians and reptiles in the same enclosure, due to the great differences in their requirements, but green anoles uniquely span this gap.

Mixed-Species Considerations

When maintaining a mixed group of animal species, always provide more space than would be required for the same number of individuals in a single-species terrarium.  Be sure also to keep in mind the different feeding strategies of each.  For example, American toads will likely gobble up all non-climbing insects before anoles even begin to feed. On the other hand, anoles will leave no food for nocturnal hunters, such as green treefrogs, if all feeding is done during the day (the solution is to add a portion of the diet after the lights have gone out).

Check back on Friday for the conclusion of this article.

Happy New Year to you and yours!

Frank Indiviglio

The Green Iguana (Iguana iguana) on the Venezuelan Llanos – Notes from the Field

Hello, Frank Indiviglio here.

green iguana on Venezuelan LlanosI grew up “knowing” green iguanas to be largely arboreal lizards of thickly-forested habitats.  In time, I was able to confirm that impression by observing them high in the canopy of a Costa Rican rainforest, and in the tall trees of Tortuguero Island, Costa Rica…where, in accordance with what I had read, they dove into the river when disturbed.

So I was quite surprised, upon arriving in Venezuela’s flat, largely treeless llanos, to find these flooded grasslands well-stocked with the huge lizards.  I was there to study green anacondas (also a surprising find, given my past impressions, but we eventually tagged over 500) but found it impossible to limit my attention to them, so overwhelming was the diversity of wildlife.

The green iguanas grazed on the flat, treeless terrain like so many cows…in fact, they were often among cows, as much of our work was on a cattle ranch.  When threatened (i.e. by me trying to catch one), they took off at incredible speeds and dove into the water. 

Anaconda surfacing on Venezuelan LlanosOne stout brute of 5’11″ in length (please see photo showing side-view) absolutely refused to enter the water when he reached its edge.  He held his ground, thrashing his tail (please see photo showing cut left on my arm by a smaller animal’s tail) and lunging at me.  Once subdued, I was able to see that he had numerous old wounds that had likely been inflicted by piranhas, and was missing several toes.  Perhaps his stretch of the river had a particularly aggressive piranha population, and he preferred a battle on land to another swim!

Venezuelan LlanosI’ve included a photo of typical iguana habitat in Venezuela’s central llanos country, to perhaps show you why I was so surprised to find the lizards there (the creatures in the foreground are capybaras, world’s largest rodent).  Also included is a photo of another reason that an iguana might choose to run or fight rather than swim – a huge green anaconda basking at the surface.

Today we can see ample evidence of the green iguanas’ adaptability right here in the USA – feral animals live in areas ranging from beaches to suburban gardens throughout south Florida!

Please write in with your questions and comments.  Thanks, until next time, Frank Indiviglio.

Detailed information on green iguana behavior and typical habitats is posted by the Green Iguana Society at:

http://www.greenigsociety.org/inthewild.htm

UVB Bulb Update: Zoo Med now provides free email reminders when it is time to replace reptile or bird full spectrum bulbs

Hello, Frank Indiviglio here.

Zoo-medRecently I wrote about some exciting information that has recently come to light concerning the effectiveness of Zoo Med UVB lamps (please see my article Product Review: The Zoo Med Reptisun 10.0 High Output UVB Lamp and 5.0 UVB Lamp, Part I and Part II for further information). 

One drawback inherent in all UVB lamps (bulbs) is the fact that the lamp will continue to burn brightly long after its UVB output has declined or even ceased.  To further complicate matters, the effective life varies from model to model, and among different manufacturer’s lamps.

Zoo Med has recently introduced a service wherein customers are reminded of lamp replacement dates via email.  Lamp purchasers register the purchase date, model, terrarium type and species kept…based upon this information, the company determines the ideal time to replace the lamp and sends an email notice as that time approaches.  Advances in technology that affect lamp life will be incorporated into the system.

A tip: if you have a large collection, you may wish to invest in a small UVB meter.  UVB output and useful life can vary even among lamps manufactured by the same company.  Actually monitoring UVB production will allow you, in some cases, to leave a lamp in place after its usual expiration date.  Also, once UVB output has declined, you can move the lamp to a situation where it can be placed closer to a basking site or perhaps use it for a species that has lower UVB requirements. 

You can read about Zoo Med’s new program at:

http://zoomed.com/Join/UVBSignup.php

Thanks, until next time, Frank Indiviglio.

Happy Holidays from Frank and ThatPetPlace.com

Thanks for being a loyal That Reptile Blog reader in 2008! Have an excellent holiday and please accept this exclusive gift from ThatPetPlace.com. 10% off your order over $80. Use promo code “HOLIBLOG“ at checkout. Offer valid until January 2nd, 2009. 

Santa Bearded Dragon

 

New articles start again Friday the 26th.

Until than,

Happy Holidays from Frank and the ThatPetPlace.com staff!

The Natural History and Captive Care of the Mexican Axolotl, Ambystoma mexicanum: Natural History – Part 2

Click here: The Natural History and Captive Care of the Mexican Axolotl, Ambystoma mexicanum: Natural History – Part 1, to read the first part of this article.

Diet
Mexican axolotls feed upon shrimp, aquatic worms, copepods, insects and other invertebrates and small fish. Adults are major predators upon small axolotls and axolotl eggs. The larvae are largely carnivorous, but may consume some algae as well.

Their main predators are herons and other wading birds, fishes and larger axolotls.

Reproduction
Males deposit spermatophores (sperm-filled capsules) on the lake bottom from March through June. After nudging the cloacal region of a gravid female – and being nudged in return – the male undulates his tail in front of her, most likely releasing pheromones (chemical attractants) in the process. He then leads the female over the spermatophore, which is taken into her cloaca. Fertilization occurs internally. The eggs, 100-300 in number, are laid after a gestation period of 2 weeks. They are attached to aquatic vegetation and hatch in 10-14 days.

The young reach sexual maturity in approximately 18 months. The Mexican axolotl is a paedormorphic (or neotenic) salamander, meaning that it retains a number of larval characteristics, including external gills (adults have lungs as well) and an aquatic lifestyle. Animals injected with the thyroid gland hormone thyroxin will transform into terrestrial adults, but do not survive for long.

Economic Importance
The Mexican axolotl is an ideal laboratory subject, and quite important in medical research. Studies of it have led to important advances many fields, including gene expression, neurobiology and limb/organ regeneration.

Axolotls possess a greater facility for regeneration than do most amphibians, and can re-grow limbs, digits, gills, tails and portions of the liver, spleen and eye. This ability may have important implications for people, and has been under investigation for some time.

Miscellaneous
Nearly all axolotls in captivity today can trace their origins to specimens collected from Lake Xochimilco and shipped to Paris in 1864. Three aquatic salamanders in the Genus Ambystoma have historically shared this species’ habitat, and it is believed that hybridization with these occurred at the time of that original collection. Current lab and pet populations may, therefore, differ genetically from wild axolotls.

The axolotl is closely related to the tiger salamander (A. tigrinum), and hybrids are fertile. Tiger salamanders also exist in neotenic form in certain populations. There is evidence that the animals forming the basis of today’s captive stock have interbred with neotenic tiger salamanders.

The name “axolotl” is taken from that of the Aztec god Xolotl, who was believed to have taken on the animal’s form, and loosely translates to terms such as “water dog”, water sprite”, “water slave” and “water monstrosity”.

We’ll take a look at captive care next time. Until then, please write in with your questions and comments. Thanks, Frank Indiviglio.

I have written articles about axolotl relatives as well. Please see:
The Spotted Salamander, Ambystoma maculatum – Part I and Part II
Algae and Salamander Eggs – an odd partnership

The abstract of an International Zoo Yearbook article detailing the use of the axolotl as a “flagship species” for the conservation of its habitat is posted at:
http://www.ingentaconnect.com/content/bpl/izy/2008/00000042/00000001/art00014;jsessionid=1hpc0rtn02l2l.alexandra?format=print

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