A female Common Blackbird (Turdus merula) in her nest. Cup nests like the one shown here, usually made of pliable materials like grasses, are commonly built by passerines. Other types of nests include 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, or a mud dome with an entrance tunnel.Photo: JJ Harrison
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