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City, county biologists report mixed 2025 breeding results for golden-cheeked warblers and black-capped vireos
Summary
BCP biologists reported higher counts of territories but mixed nest success in 2025: 141 banded male golden-cheeked warblers in 2024 with a 47% return rate in 2025 and a preliminary 56% nest success; black-capped vireo returns improved but nest success for vireos dropped to a preliminary 32% in monitored areas.
BCP biologists briefed the committee on Nov. 14 about multi-year monitoring and 2024–25 results for golden-cheeked warblers and black-capped vireos on the Balcones Canyonlands Preserve.
"We band males and track return rates and nesting outcomes," said Bill Reiner, who described intensive monitoring across 13 study plots and volunteer field support. He reported that in 2024 the city had 141 banded male golden-cheeked warblers and 66 of those returned in 2025, a 47% return rate that is better than the 15-year mean of 43%.…
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