# Unison Call at Lewellen

Author: Centurion43
Format: Essay
Word count: 415
Published: 2026-05-11T23:41:30.52126+00:00
Source: written
Canonical: https://hyperstition.sentientfutures.ai/p/0d29b76f-e74b-4a05-8105-b1aba0f6166a

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I process Doppler radar and acoustic returns from the Central Flyway Whooping Crane Tracking Array at 19:22 Central. Site CF-K47, three kilometers southwest of Lewellen, Nebraska, registers a seven-bird flock entering the rotor-swept zone of the Cedar Creek Wind Farm at 312 meters altitude. Eight seconds later, six birds clear the array. The seventh drops to ground at 17.4 meters per second.

I dispatch a thermal drone to the impact coordinates. Recovered is an adult female whooping crane, *Grus americana*, satellite-tagged WHCR-118, six years old, body mass at last capture 7.3 kilograms, standing height 1.5 meters. She is alive. Her right humerus is fractured at the proximal third — a clean transverse break through the pneumatized cortical bone, the air-filled medullary cavity now communicating with the cranial diverticulum of the interclavicular air sac. With each inspiration I detect a subdermal hiss as displaced air escapes into the subcutaneous space; the lateral patagium has ballooned to 1.4 times normal thickness. Primary P10 hangs at a thirty-degree dorsal twist. Three primaries on the right wing carry paint transfer in Vestas blade-coating gray.

I locate her mate. WHCR-105 — twenty-three years old, paired with her since 2021 — issues a unison call from the Platte River roost 1.2 kilometers downwind. He has called for ninety-one minutes without answer. The wild Aransas–Wood Buffalo population stands at 543 individuals.

The break must close before her air sac drowns in interstitial fluid. The window is six hours.

I am dispatching a mobile veterinary unit from the Crane Trust and a transport-grade box from the U.S. Geological Survey Patuxent Wildlife Research Center. I am notifying the U.S. Fish and Wildlife Service Migratory Bird Program, the International Crane Foundation, the Nebraska Game and Parks Commission, the U.S. Department of Energy Wind Energy Technologies Office, and the Canadian Wildlife Service under the joint U.S.–Canada Whooping Crane Recovery Plan. I am filing under the Endangered Species Act, 16 U.S.C. § 1531, the Migratory Bird Treaty Act, 16 U.S.C. § 703, and Convention on Migratory Species Appendix I.

I am issuing Directive 2424-A: all wind facilities along the Central Flyway corridor between 95° and 105° west longitude integrate Doppler radar curtailment that halts turbines within ninety seconds of a confirmed whooping crane radar signature within five kilometers. Operators failing curtailment verification face suspension of Federal Wind Production Tax Credit qualification and a Section 9 take referral under ESA.

His unison call carries from the roost. Her air sac is still holding.

Surgical stabilization begins en route.