Birds are not taught by anyone to build nests; instead, nest-building is an instinctive behavior that is hardwired into their brains through evolution. Each bird species has a characteristic way of building nests, and even birds raised in isolation often construct nests similar to those of their kind. This instinct has been passed down over generations, allowing birds to build nests using twigs, leaves, mud, and other materials without needing formal instruction or imitation.
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