Birds


A. Organized Body Made of One or More Cells

Most of the bones of the birds skeleton are hollow to save weight. Feathers provide color, camouflage, and protection, and keeps in heat.

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Bird skeleton.

B. Obtain and Use Energy

The food birds eat is swallowed into a bag like crop for storage, goes to the stomach, and is mashed into a pulp. Examples of food birds eat are insects, seeds, and small rodents.


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Birds eating.

C. Reproduce

The eggs pass from the ovary, along the oviduct tube, and out through the cloaca. Before this happens, the bird mates with another bird.




D. Grow and Develop

More developed chicks leave their nest soon after birth to learn how to catch food even though they can't fly until they develop proper flight feathers.


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Bird developing feathers.

E. Respond to Stimuli

Birds have great sight and hearing. Some owls can hunt in the dark, because they can pick up sounds humans can't.

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Owl hunting at night.

F. Exchange Gases with the Environment

Air is pulled through the lungs, into nine air sacs to give the bird a greater flow of oxygen.


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Air being pulled through a birds body.

Resources:

Peacocks, Penguins & Other Birds

Birds