North American Birds

VOLUME 70 NO2 2018

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

Issue link: http://nab.aba.org/i/1028840

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144 PRESUMED COLIMA x VIRGINIA'S WARBLER HYBRIDS IN TEXAS N O R T H A M E R I C A N B I R D S primarily in habitat dominated by extensive Gambel Oak (Quercus gambelii) woodlands (thickets), mixed with Gray Oak (Q. grisea) and an over-story of scattered Ponderosa Pine (Pinus ponderosa) and/or Southwestern White Pine (P. strobiformis) on north-facing slopes. Additionally, a few individuals iden- tified as Virginia's Warblers based on song and/or plumage characteristics were found at lower elevations in habitat comprised primarily of Silverleaf Oak (Q. hypoleucoi- des), Mexican Pinyon Pine (P. cembroides), Alligator Juniper (Juniperus deppeana), and Ponderosa Pine. Observations during these surveys included multiple singing males on well-defined territories, females present dur- ing the summer, and, on occasion, adults feeding young. Prior to 1999, the Colima Warbler was documented as a breeding species in the United States exclusively in the Chisos Mountains of Big Bend National Park in southern Brewster County, Texas (Ober- holser 1974, Wauer and Ligon 1974, AOU 1998). During a systematic census of the Davis Mountains Preserve on 18 June 1999, a survey crew working in the area of Tobe Figure 4 ( above ) • Presumed male hybrid in Silverleaf Oak in Madera Canyon on 8 May 2005. This individual is typical of intermediate birds: note dingy gray body plumage, obvi- ous brownish wash on the flanks, and lack of yellow on the breast. Photo by © Mark W. Lockwood. Figure 5 ( below ) • Presumed male hybrid in Ponderosa Pine in No-name Canyon, a part of upper Limpia Canyon on 10 May 2008; note dusky-brown flank coloration and especially brownish hue across the breast, and pale yel- low under tail coverts. Photo by © Mark W. Lockwood.

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