eWestern Birds

The Quarterly Journal of Western Field Ornithologists

Vol. 33, No. 4
December 2002
Western Field Ornithologists


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Noteworthy Waterbird Records in the Delta of the Río Colorado, Mexico
Eric Mellink, José Alfredo Castillo, and Aimeé De La Cerda

ABSTRACT: Surveys of the Río Colorado delta in summer 2002 revealed abandonment of one large heronry but the existence of another large and several small, inconspicuous heronries previously nonexistent or undetected. Most notable among these mixed-species colonies were two nests of the Tricolored Heron and two fledglings of the Reddish Egret, representing considerable northward extensions ofthese species’ breeding ranges.

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