A sleeping bird is more vulnerable to danger, so finding shelter from predators and weather is vital to birds' survival. As you might imagine, each species has a technique of locating shelter as unique as its methods of finding food, and this varies based upon options available in the environment. Cavity nesters (bluebirds, chickadees, titmice, some woodpeckers and swallows, for example), tend to roost in enclosed areas such as tree hollows, bird houses, caves, or culverts. Sparrows, warblers, thrushes, and other songbirds frequently roost for the night amid thick vegetation. At all times, it’s important that they remain concealed from owls, raccoons, snakes, and other predators.
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