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Archive for November 25, 2014

Bird Nests Visible

11-25-14 black-throated blue nest  043When leaves start falling from deciduous trees, bird nests appear out of nowhere. Most songbirds abandon their nest after raising one brood, never to return to it. An empty nest sits where it was built until the elements break it down, another animal recycles the material from which it was made, or a mouse takes over winter occupancy. The period of time after the leaves fall and before winter and other creatures deconstruct the nests is ideal for discovering who raised their young under your nose this past summer.

Just as each species of bird has its own distinctive song, each species also builds a unique nest. It is often possible to determine what species built a nest without ever setting eyes on the bird. The size, shape, material used and habitat in which a nest is built are remarkably similar for all birds of a given species. Eastern phoebe nests mainly consist of mud covered with moss. Gray catbirds incorporate grape vine into their nests, and line them with rootlets. Ovenbird nests are on the ground, roofed over like old-fashioned ovens. While federal permits are necessary to collect these nests, they can be admired and identified without a permit. (Photo: the combination of this nest’s size (3” outer diameter), location (3’ off the ground) and material used (yellow birch bark strips, grasses, cocoons and black rootlet lining) pinpoint the builder as a Black-throated Blue Warbler.)

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