an ectothermic vertebrate thst has feathers and a 4-chambered heart.

one of the large feathers that gives shape to the birds body.

short, fluffy feathers that are specialized to trap heat and keep the bird warm.

thick-walled, muscular part of the stomach.

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Science Lesson 54

Key Terms

Question	Answer
bird	an ectothermic vertebrate thst has feathers and a 4-chambered heart.
contour-feathers	one of the large feathers that gives shape to the birds body.
down feathers	short, fluffy feathers that are specialized to trap heat and keep the bird warm.
crop	internal heat
gizzard	thick-walled, muscular part of the stomach.