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20 Cards in this Set
- Front
- Back
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_____ is the feathers.
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Plumage
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What is one characteristics of birds that help their flight?
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Their light weight.
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The __ __ is one of the largest flying birds.
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Andean condor
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______ is pertaining to birds.
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Avian
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What is unusual about the bones of the birds?
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They are strong even though they are hollow, with cross bracing.
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Compare the weight of birds' bones vs human bones?
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The skeleton of the bird is about 5% of its body weight while a human's skeleton is about 14% of its body weight.
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The ____ of the flying bird is very strong and allows for the powerful flight muscles in the wings.
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sternum
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Describe the skull of the bird.
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The skull is lightweight but strong - no teeth but bills made of a tough, light protein.
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The tough, light protein of the birds' bill is called ___.
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keratin
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Compare the human arm to the wing of a bird.
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The humerus of the bird is much shorter ( and stronger)than the humerus of a human. The radius and ulna are much longer in the bird than the human.
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The bird's thumb bones support the _______, a retractable group of feathers on the front of the wing.
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alula
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The most important flight muscles in a bird are the ______.
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pectorals
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The balance point is known as the __ __ _____
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center of gravity
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The center of gravity in a bird is _______ to give the bird stability.
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low
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The bird's heart is ______ in relation to the bird's body size - which is needed to pump so much blood.
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larger
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The ____ is the main artery leaving the heart.
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aorta
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The pectoral muscles are as large as the _____ in the bird.
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aorta
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The __ ___ of the bird allow air to flow through the lungs, and not just in and out.
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air capillaries
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The bird inhales and exhales ____ to move each breath of air through its lungs.
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twice
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The air circulates through the bird's ________ bones to cool the body off.
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hollow bones
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