An ectothermic vertebrate that lays eggs and has feathers and a four-chambered heart.

A large feather that helps give shape to a bird's body.

A short, fluffy feather that traps heat and keeps a bird warm.

An internal organ of many birds that stores food.

A muscular, thick-walled part of a bird's stomach that squeezes and grinds partially digested food.

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Chapter 4 Vocab

Chapter 4 Vocab Part 1

Word	Definition
birds	An ectothermic vertebrate that lays eggs and has feathers and a four-chambered heart.
contour feathers	A large feather that helps give shape to a bird's body.
down feathers	A short, fluffy feather that traps heat and keeps a bird warm.
crop	An internal organ of many birds that stores food.
gizzard	A muscular, thick-walled part of a bird's stomach that squeezes and grinds partially digested food.