Bats are the only mammals capable of true flight. Their wings are thin double membranes stretched between their fingers, arms, furry bodies, hindlimbs, and tails. The thumb and small hind feet are clawed. Bats have sharp teeth, although many eat only insects. Most are nocturnal, roosting by day in caves, trees, attics, and other sequestered places, hanging by their clawed feet with their heads downward. Poor vision is attributed to their small, beady eyes. Perhaps as a substitute, they have developed a sonar system called echolocation. They emit supersonic sound waves that bounce back from solid objects, enabling them to avoid head-on crashes in night flight and to locate their food: fruits or flying insects. Bats live in the temperate zones of the world. In frigid weather, some bats migrate to warmer climates, while others hibernate.
KeywordsClotting Time Thrombin Time Sonar System Sharp Tooth Ristocetin Cofactor
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