Friday, June 17, 2005

Desert Iguana
Desert Iguana
Range
Mojave and Sonoran deserts of southeastern California, southern Nevada and western Arizona.
Habitat
Arid, sandy desert regions among scattered rock and Creosote Bush

Description
The mature Desert Iguana is 10 to 16 inches long with a large, round body and a long tail. It is colored brown around the head which diffuses into a reddish brown netlike pattern. It has tan or gray spots on the neck and trunk.. The tail is gray or white encircled with rows of dark spots.

Adults will have a pink hue on the side of their belly during the breeding season, April and May. A clutch of 3 to 8 eggs is laid June and July, with the young appearing in August and September.

The Desert Iguana is a wary , diurnal lizard that will climb into bushes seeking cooler areas in extreme heat, but it will remain active when temperatures are as high as 115 degrees F.

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   Green iguana
Green Iguana

Physical Appearance: Full-grown green iguanas are usually between four and six feet, although they have been known to grow up to seven feet long. This includes the tail, however, which can make up about half the body length and, in addition to its green color, has black stripes. Green iguanas, not surprisingly, are green in color, but can be found in many different shade ranging from bright green, to a dull, grayish-green. Their skin is rough, with a set of pointy scales along the iguana's back. Green iguanas have long fingers and claws to help them climb and grasp.

Geographic Range: The green iguana is found over a large geographic area, from Mexico to southern Brazil and Paraguay, as well as on the Caribbean Islands.

Adaptations: Besides the long fingers and claws mentioned above, green iguanas have many excellent interesting adaptations. Green iguanas have good senses of hearing and smell, and superb vision. Their long tail is also quite sharp, and is snapped in the air as a defense mechanism. The tail can also break off if caught by a predator, but grows back without permanant damage. Green iguana skin is very water resistant, and tough to avoid cuts and scratches. The coloring of the skin helps camoulflage the green iguana, which means that they blend in easily to their surroundings to remain undetected by predators. If they are etected however, and need to escape quickly, these iguanas can dive from trees into water, and swim well. Green iguanas are quite sturdy-- they can fall 40-50 feet to the ground without getting hurt! Male green iguanas have a special flap of skin called the dewlap. Male iguanas can raise their dewlap to appear bigger than they really are, either to intimidate predators, or to impressive females. Both male and female green iguanas can store fat under their jaws and in their necks for times when there is not much food available.

Habitat: Iguanas live in tropical rainforest areas, generally in lower altitudes in areas near water sources, such as rivers or streams. They spend most of their time high in the forest canopy, about 40-50 feet above the ground.

Behaviour: Iguanas are diurnal, meaning that they are awake during the day. They are also cold-blooded, which means they do not produce their own body heat. In other words, if it is cold, the iguana is cold too. So to stay warm, green iguanas bask in the sun, lying on warm rocks as they soak up the sun's heat.


Reproductive Cycle and Family Habits: Green iguanas tend to live alone, but may be seen in groups occasionally in good sunny basking spots. Iguanas lay many eggs at a time (about 50), in holes inthe ground called burrows. They also dig pretend burrows to confuse any animals that may be looking for eggs to eat. After female iguanas lay the eggs, they leave them and do not return. When iguana babies hatch, they grow up without care from their parents. Green iguanas lay many eggs, but only 3-10 babies actually survive to be adults. It takes green iguana eggs about 8-10 weeks to hatch, then takes baby iguanas about 2 years to become mature adults.

Diet: Green iguanas are omnivorous, so they eat both plants and meat. They tend to eat mostly plants, though, especially leaves and fruits. Sometimes green iguanas (especially young ones) will eat eggs, insects, and small vertebrates.

Threats to Survival: Like many trpoical species, the green iguana is also threatened by habitat destruction. The green iguana is also a victim of the pet industry. Many people in the United States and elsewhere want a green iguana for a pet, so there is a big demand for their capture. Although many pet iguanas are now being raised on iguana farms, capture from the wild has lowered their numbers. In addition, some local populations of South America hunt the green iguana for food.

Conservation Efforts: Laws have been made to protect green iguanas from over-hunting and the pet-trade. Unfortunately, these laws are not enforced very well. Many people are trying to develop protected areas for the iguanas, and to educate local populations about the importance of conservation. Some of these educational programs help local populations find new ways of using the land, without permanantly destroying it. For example, for people who want to continue to eat the green iguana, programs are being developed to raise these animals for food, instead of hunting wild ones. Tony Garel, at the Belize Zoo and Tropical Education Center, is woking on one such project to conserve the iguanas and educate local communities Tony has used captive breeding techniques to increase green iguana populations, and has released some of these iguanas into the wild.


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