Featured in this Plate
The Cliff Swallow is probably far more common today than prior to industrialization. Originally it built its jug-shaped mud nests on the sides of cliffs. However, the sides of barns and the supports of bridges provided sheltered sites that were far more widespread than the natural ones. Taking advantage of these artificial locations, the species has invaded many areas where it never nested before. Although it is continuing to spread in the east, it is still more common in the west, where practically every culvert and highway bridge seems to have its own Cliff Swallow colony.
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