Birds build nests
Birds collect twigs, leaves, and grass to weave a nest in a tree. The nest keeps their eggs safe and warm.
Bears use caves and dens
Bears live in caves or dig out dens in the ground. In winter, they sleep inside their den to stay warm — this is called hibernation.
Fish live in water
Fish breathe through gills and stay in rivers, lakes, or the ocean. A goldfish in a tank lives in a small "home" of water too!
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