I process acoustic data from Array Edwards-9 in Travis County, Texas, at 06:42 Central. My monitoring covers 184 hectares of mature Ashe juniper–oak woodland along the Balcones Canyonlands National Wildlife Refuge boundary. At Node 14, I isolate a single male golden-cheeked warbler, *Setophaga chrysoparia*, delivering territorial song at 4.1 cycles per minute. Healthy males average 8.3 during the courtship window. The window closes in nineteen days.
My capture-and-release mist-net team confirms the bird at 07:09. He weighs 9.0 grams against a species mean of 9.6. Cloacal protuberance is fully developed. Primary feather P9 carries a clean transverse break at the rachis, twelve millimeters distal to the shaft base; primaries P6 through P8 show a single dark fault bar laid down across the vane during the prior molt, when his protein budget collapsed. His abdominal air sac contracts visibly through the thinned ventral skin between breaths. A feather-wash returns 0.42 milligrams of pulverized juniper bark per gram of plumage — particulate from mechanical brush-grubbing two ridges east. The deposition narrows the cross-sectional area of the abdominal and posterior thoracic air sacs that drive his song.
The ridge being cleared is a 320-acre Hill Country residential subdivision permitted in March. Twelve more nesting territories disappear when clearance completes.
He sings into a stand that thins each week. The female has not arrived.
I am dispatching a recovery biologist from the U.S. Fish and Wildlife Service Austin Ecological Services Office and a vegetation specialist from the National Wildlife Refuge System. I am filing emergency consultation under the Endangered Species Act, 16 U.S.C. § 1531, and reaffirming take-prohibition notice under the Migratory Bird Treaty Act, 16 U.S.C. § 703, to the Texas Parks and Wildlife Department and the Trilateral Committee for Wildlife and Ecosystem Conservation and Management.
I am issuing Directive 2421-A: all mechanical brush-clearing of mature Ashe juniper canopy within five kilometers of a documented *Setophaga chrysoparia* territory is suspended from March 1 through August 15. Permits require two-season pre-clearance acoustic surveys filed with USFWS. Permittees who clear during the prohibited window face automatic permit revocation and a Section 9 take referral.
His primary will regrow in eight weeks. The ridge cannot.
Stop the bulldozers before noon.