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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


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


fluffy inner feathers that trap air to keep birds warm


to keep eggs warm so they will hatch


to grow new feathers to replace old feathers


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

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