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Biology 31 2 birds

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Biology 31 2 birds

  1. 1. 31-2 Birds<br />
  2. 2. feather<br />Structure made mostly of protein that develops from a pit in a bird’s skin.<br />
  3. 3. endotherm<br />Animal that generates its own body heat and controls its body temperature from within.<br />
  4. 4. crop<br />In earthworms, part of the digestive system in which food can be stored; in birds, structure at the lower end of the esophagus in which food is stored and moistened.<br />
  5. 5. gizzard<br />In earthworms, part of the digestive system in which food is ground into smaller pieces; in birds, a muscular organ that helps in the mechanical breakdown of food.<br />
  6. 6. Air sac<br />One of several sacs attached to a bird’s lungs into which air moves when a bird inhales; allows for the one-way flow of air through the respiratory system.<br />
  7. 7. Key Concept<br />Birds are reptile-like animals that maintain a constant internal body temperature. They have an outer covering of feathers; two legs that are covered with scales and are used for walking or perching; and front limbs modified into wings.<br />
  8. 8. Key Concept<br />Birds have a number of adaptations that enable them to fly. These adaptations include highly efficient digestive, respiratory, and circulatory systems; aerodynamic feathers and wings; strong, lightweight bones; and strong chest muscles.<br />

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