eWestern Birds

The Quarterly Journal of Western Field Ornithologists

Vol. 55, No. 1
March 2024
Western Field Ornithologists

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Nesting Bald Eagle Population Numbers, Density, Territorial Resources, and Relationship to Human Development in Northern Colorado’s Front Range
Dana J. Bove, Holly A. Anderson, Matthew A. Smith, and Theo A. Kuhn

David F. DeSante’s Birds of Cabo San Lucas, Fall 1968: A Historic Account
David F. DeSante, Richard A. Erickson, Gerardo Marrón, and Peter Pyle

First Record of Tricolored Blackbirds in Idaho
Peter J. Olsoy and Katie J. Sorenson

Factors Influencing Survival of Black-chinned Hummingbird Nests in Southwest Colorado
Joseph C. Ortega and Catherine P. Ortega

Second Prebasic Molt of a Black-headed Gull at Anchorage, Alaska
Robert L. Scher

NOTES

American Crow Cracks Open Bivalve via Automobile
Sierra R. Glassman and Emily Y. Banno

Front cover photo by © Dana J. Bove of Boulder, Colorado: Bald Eagle (Haliaeetus leucocephalus), Broomfield, Colorado, June 2018. The prey the adult male is delivering is a Black-tailed Prairie Dog (Cynomys ludovicianus)—which Dana J. Bove, Holly A. Anderson, Matthew A. Smith, and Theo A. Kuhn found to dominate the prey taken at a third of Bald Eagle nests in northern Colorado’s Front Range urban corridor. Thus habitat sufficient to sustain a flourishing population of prairie dogs is vital to sustaining the regional population of Bald Eagles at its current level.

Back cover photo by © Gerardo Marrón of La Paz, Baja California Sur, Mexico: adult Broad-winged Hawk (Buteo platypterus), San Antonio de la Sierra, Baja California Sur, Mexico, 16 April 2014. The Broad-winged Hawk was among the species first found on the Baja California Peninsula by the late David F. DeSante during his pioneering survey at Cabo San Lucas in 1968—summarized for the first time in this issue of Western Birds by Richard A. Erickson, Gerardo Marrón, and Peter Pyle. The several Broad-winged Hawks noted by DeSante correspond with the species’ currently known status as an annual uncommon fall and winter visitor in the peninsula’s cape region.