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or the village weaver--that is too restrictive a definition. For some species, a nest is simply a shallow depression made in sand; for others, it is the knot-hole left by a broken branch, a burrow dug into the ground, a chamber drilled into a tree, an enormous rotting pile of vegetation and earth, a shelf made of dried saliva, or a mud dome with an entrance tunnel. Some birds, including magpies, have been observed building nests using anti-bird spikes. In some cases, these

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