Two female brown-headed cowbirds watch the path of a yellow warbler (below) In this particular area of Last Mountain Lake, Saskatchewan there were perhaps hundreds of warbler nests as well Red-eyed vireo, black-capped chickadee and smaller flycatchers that cowbirds could lay their eggs. This parasitic behaviour is a throw back to when the cowbirds followed the great buffalo herds across the American Mid-West.
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| Yellow warbler |
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