Main Idea Details
Reptiles and Birds 301
terrestrial
air sac
contour feather
down feather
endotherm
feather
incubate
preen gland
sternum
Reptiles and Birds
Section 29.2 Birds
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New
Vocabulary
Review
Vocabulary
Skim Section 2 of the chapter. Identify characteristics of birds that
make them different from reptiles.
Use your book or dictionar y to define terrestrial.
Use your book or dictionar y to define each term.