By Inc. Encyclopaedia Britannica
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Extra resources for Britannica Illustrated Science Library Reptiles And Dinosaurs
They have large heads, few teeth, and bodies covered in very soft, slippery scales, which enable them to slide into anthills and termite hills, their only sources of food. Their eyes, which are covered with scales, barely work. LARGE INTESTINE EMERALD TREE BOA Corallus caninus Primitive Snakes Boas and pythons were the first snake species to appear on Earth. Many have claws or spurs as vestiges of ancient limbs of their ancestors. They are not poisonous, but they are the largest and strongest snakes.
They can reach speeds of up to 9 miles per hour (15 km/h) when running, with their abdomens supported above their knees and their elbows slightly bent. They can go even faster when sliding on mud. SNOUT Long, narrow nose 1 3 How They Move TEETH are longest in front. Crocodiles have four feet. In this way, they are very similar to lizards. They are distinguished by their great size and ferocity. Several rows of bony plates that look like spines or teeth run down the length of their back. They can stay in the water for long periods of time, and they are able to swallow underwater without drowning.
The shell of the pancake tortoise is not only very flat but also very flexible because of the openings in the bone on its underside. This feature allows it to crawl into narrow cracks to escape from predatory birds and mammals. It can also squeeze itself into holes. 88 HUMANS AND REPTILES Danger: Baits and Traps ea turtles are in danger of extinction. During their migrations, they eat the bait set on hooks intended for tuna. As the turtles fight to free themselves from the hooks, they damage their internal organs and lose their buoyancy, which causes them to die from asphyxiation.