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Wednesday, June 15, 2011

The Uromastyx

Beuty Of Animlas | The Uromastyx | The Uromastyx is a genus of lizard whose members are better-known as Spiny-tailed lizards, uromastyxs, mastigures, or dabb lizards. Uromastyx are primarily herbivorous, but occasionally eat insects, especially when young. They spend most of their waking hours basking in the sun, hiding in underground chambers at daytime or when danger appears. They tend to establish themselves in hilly, rocky areas with good shelter and accessible vegetation.The generic name (Uromastyx) is derived from the Ancient Greek words ourá  meaning "tail" and mastigo  meaning "whip" or "scourge", after the thick-spiked tail characteristic of all Uromastyx species.
Their size ranges from 25 cm (10 in) (U. macfadyeni) to 91 cm (36 in) or more (U. aegyptia). Hatchlings or neonates are usually no more than 7–10 cm (3–4 in) in length. Like many reptiles, these lizards' colors change according to the temperature; during cool weather they appear dull and dark but the colors become lighter in warm weather, especially when basking; the darker pigmentation allows their skin to absorb sunlight more effectively.
Their spiked tail is muscular and heavy, and can be swung at an attacker with great velocity, usually accompanied by hissing and an open-mouthed display of (small) teeth. Uromastyxs generally sleep in their burrows with their tails closest to the opening, in order to thwart intruders.
A female Uromastyx can lay anywhere from 5 to 40 eggs, depending on age and species. Eggs are laid approximately 30 days following copulation with an incubation time of 70–80 days. The neonates weigh 4–6 grams and are about 2 inches (5.1 cm) snout to vent length. They rapidly gain weight during the first few weeks following hatching. A field study in Algeria concluded that Moroccan spiny-tailed lizards add approximately 2 inches (5.1 cm) of total growth each year until around the age of 8–9 years.
Wild female uromastyxs are smaller and less colorful than males. For example, U. maliensis females are often light tan with black dorsal spots, while males are mostly bright yellow with mottled black markings. Females also tend to have shorter claws[citation needed]. In captivity female U. maliensis tend to mimic males in color. Maliensis are, therefore, reputably difficult to breed in captivity.

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