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10 Cards in this Set
- Front
- Back
Bird blood is distinguished from mammalian blood by _____.
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nucleated red blood cells
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The stiff central shaft or quill of a feather is the ____.
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rachis
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The clear eyelid that covers a bird's eye is the ____.
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nictitating membrane
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The fight pattern in which a bird spirals higher and higher without flapping is _____.
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soaring
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A bird's voice box is the _____.
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syrinx
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When a bird inhales, the air passes through the trachea into the ____.
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air sacs
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Soft, fluffy feathers that lie close to a bird's body and help to keep it warm are _____ feathers.
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down
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The muscular organ within the digestive tract of birds that grinds food into small particles for digestion is the ____.
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gizzard
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The special sac in the esophagus that serves as a storage chamber and releases food to the rest of the digestive system at the proper rate is the ____.
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crop
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A bird's "thumb" is called the ____.
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alula
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