| Question | Answer |
| Warm-blooded | being able to control and maintain a constant body temperature even when the temperature of the environment changes |
| Pellet | the unusable and undigested material that a bird cannot process for nutrients, and is regurgitated in the form of a pellet |
| Monocular vision | seeing two different objects at the same time; a different object per eye |
| Gizzard | the stem of a feather; the hollow tube that holds the feathers together and in place |
| Crop | a large sac between the esophagus and stomach that stores food until the bird is ready to begin digestion |
| Fledge | the rearing of a young bird until it has grown its feathers and is able to fly and leave the nest |
| Aves | the Latin word for birds; a special class of vertebrates |
| Contour feathers | stiff feathers designed to cover the wings and body of a bird |
| Vertebrates | an animal with a backbone or spinal column |
| Flight feathers | special contour feathers that help a bird get off the ground, move in the air, and land safely |
| Bird of prey | a carnivorous bird (hawk, falcon, eagle, etc.) that kills and eats small mammals and other birds |
| Binocular vision | seeing only one object at a time; both eyes focus on the same object |
| Pellet | a process that most birds do with an oil secreted from a special gland; involves rubbing the oil over its feathers to protect them |
| Gizzard | to shed feathers, skin, horns, etc. before replacement with new growth |
| a special muscle of the stomach that helps the digestive process by grinding and crushing hard-to-digest food; acts like teeth |
| Raptor | a process that most birds do with an oil secreted from a special gland; involves rubbing the oil over its feathers to protect them |
| Drag | anything that hinders or hampers the speed; something that pulls you down |
| either of the paired organs of flight of a bird, bat, insect, etc. |
| Monocular vision | a transparent third eyelid hinged at the lower lid of the eye of raptors, and closes laterally across the eye |
| Cere | fleshy area above the beak, where the nostrils of most birds are located |
| Carrion | decaying flesh of a dead body |
| a tough, fibrous protein; the basic substance of hair, nails, horns, feathers, shafts, etc. |
| Wings | a transparent third eyelid hinged at the lower lid of the eye of raptors, and closes laterally across the eye |
| Talons | the lethal weapons of raptors; powerful feet with toes (usually three or four) having sharp ends |
| Fovea | a rodless area of the retina enabling a bird of prey acute vision |
| Down feathers | fluffy feathers designed to help insulate and keep a bird warm |
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