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BIRDS (characteristics of birds (Lightweight bones: A strong, lightweight…
BIRDS
characteristics of birds
Lightweight bones: A strong, lightweight skeleton allows birds to fly. Their bones contain cavities of air. They have powerful flight muscles called keel that are attached to the sternum.
Respiration: When birds inhales oxygenated air moves through the trachea into posterior air sacs. Only oxygenated airs moved through the lungs, it is moved in a single direction.
Feathers: specialized outgrowths of the bird's skin. They are mad up of keratin (A protein in the skin). And they have two main functions 1.Flight and 2.Insulation.
Circulation: a birds circulatory system help it maintain high levels of energy by efficient delivery of oxygenated blood to the body. They also have a 4 chamber heart, 2 upper atria and 2 lower ventricles.
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The brain and senses:
The Cerebellum also controls eating, singing, flying and instinctive behaviour.
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Reproduction
After fertilization, the amniotic egg develops and is encased within a hard shell.
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