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: The Golden-cheeked Warbler (Dendroica chrysoparia) and Black-capped Vireo (Vireo atricapillus) are endangered migratory songbirds that nest on Camp Bullis, Texas. The warbler has been censused each year since 1991. Data has been collected on the vireo since 1989. This report discusses the results of the 1997 field season. This information can be used by training managers to ensure success of the training mission while complying with the Endangered Species Act. Results suggest that the 1997 warbler population was relatively stable, based on point counts, surveys, and estimates of density. Warblers were detected on 66.7 percent of the survey lines; the installation-wide density estimate was .076 birds per hectare compared to an overall density of .071(1991 to 1997). The number of Black-capped Vireos detected on the installation rose from 6 in 1996 to 12 in 1997. Historically, approximately 11 male vireos were detected annually from 1989 to 1997. Most vireos found in 1997 were at sites that have housed vireos in the past. Some vireos were also found in new areas (e.g., Spoffard Hill) while some traditional sites e.g., Sykes Hill) were not occupied in 1997. This report also presents recommendations addressing monitoring needs and future research.

Results of the 1997 Golden-cheeked Warbler and Black-capped Vireo Monitoring Program on Camp Bullis, Texas