Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 FOREST COMMUNITIES 425 ing snakes tend to become elongate, a tendency which is also shown by the arboreal agamid lizards of the Old World and by the unrelated iguanid ones of tropical America (Fig. 116). Some heavy-bodied snakes, such as the vipers and pit vipers, have developed prehensile tails in the tropics of both hemispheres; chame- leons and a few other lizards are similarly supplied. The prehensil

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Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 FOREST COMMUNITIES 425 ing snakes tend to become elongate, a tendency which is also shown by the arboreal agamid lizards of the Old World and by the unrelated iguanid ones of tropical America (Fig. 116). Some heavy-bodied snakes, such as the vipers and pit vipers, have developed prehensile tails in the tropics of both hemispheres; chame- leons and a few other lizards are similarly supplied. The prehensile tail has been developed independently by many different sorts of arboreal mammals. In its typical form, a prehensile mammalian tail is free from hair, and bears, near the outer end, sensitive ridges like those of the palm of the hand which aid is giving a sure grip. Usually these are on the ventral side, but in an arboreal mouse (Pogonomys)

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