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blubber

a layer of fat that stores energy and provides insulation

brood patch

an area of skin with few or no feathers, which is warmed by blood vessels in order to incubate eggs

crest

a tuft of feathers sticking up from the head of a bird

down

fluffy inner feathers that trap air to keep birds warm

incubate

to keep eggs warm so they will hatch

molt

to grow new feathers to replace old feathers

rookery

a place where large groups of birds or mammals gather to raise their young

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