By Pink Floyd
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Yet these muscles are lightweight owing to elongation primarily of tendons rather than of the active muscle mass. In contrast, snakes that constrict their prey, such as boas and pythons, have heavier, shorter muscle units that produce great strength of constriction but slower locomotion. Feeding and digestion Many of the prominent and interesting adaptations of reptiles are related to the capture and digestion of food. Most 26 Many snakes seize prey and swallow it as they struggle. However, snakes that consume animals capable of inflicting harm generally subdue them by means of constriction or envenomation.
Most lizards have a sprawling limb posture, but some quadrupedal reptiles, such as chameleons and rapidly moving crocodilians, have evolved a more erect or nearly vertical position of the limbs. While the animal is standing, the musculature must support the body between the laterally placed feet. However, most reptiles do not remain standing while motionless but minimize expenditure of energy for postural support by resting the body on the substrate. Sprawling limbs promote stability and are advantageous when lateral undulations of the body are used in locomotion.
M. Martin. Amniote Origins, Completing the Transition to Land. San Diego: Academic Press, 1997. , Peter Dodson, and Halszka Osmólska, eds. The Dinosauria. Berkeley: University of California Press, 1990. J. ” These subjects are richer and better understood when considered in the contexts of evolution, ecology, and behavior. Thus an integrative discussion of these topics is especially meaningful for understanding the fascinating lives of reptiles. Skeleton, muscle, and movement Reptiles evolved from limbed ancestors, and they have an axial skeleton consisting of the vertebral column, limbs, and central nervous system encased in bone.
Animals Songbook - CD-Booklet by Pink Floyd