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incubation— the period during which baby birds develop within their eggs. During the incubation period, the eggs must be kept warm so they will hatch. down— a soft and thick layer of feathers which can be found closest to the skin of a bird. plumage— the feathered covering of a bird. predator— an animal that captures, kills, and feeds on other animals. prey— animals that are hunted for food. talon— the claw of a bird of prey, such as a bald eagle. Words to Understand