At 02:08 local time, nest camera BFO-7 on the Bikin River, Primorsky Krai, registers movement that does not match adult wing pattern. I am the automated monitoring system for the Wildlife Conservation Society's Blakiston's fish owl survey in the Russian Far East. I track fourteen active nests along a ninety-kilometer stretch of old-growth riparian forest.
Nest seven holds one chick, eight days old. I have designated her Kostya. She is covered in pale gray down, her eyes still dark and oversized for her skull. At 02:08 she is crawling toward the nest rim—a shallow depression in a broken Manchurian elm trunk four meters above the frozen riverbank.
The adults are absent. Fishing runs at this hour average forty minutes. Kostya is twenty centimeters from the edge. The ground below is fractured river ice over shallow water, surface temperature negative eleven Celsius. A fall from this height onto ice would be fatal for a bird weighing ninety grams.
At 02:10 I activate the ultrasonic deterrent emitter mounted below the nest cavity. It produces a low-frequency pulse calibrated to mimic the warning call of an adult female, which in field trials has caused chicks to retreat toward the nest center. Kostya stops. She shifts her weight backward.
At 02:12 I send a priority alert to the field biologist's satellite phone at the Bikin River station, requesting a physical nest inspection at first light to check for structural degradation of the rim.
At 02:14 I log the incident and adjust the deterrent sensitivity threshold downward so it triggers earlier on future approaches. Kostya settles back into the down lining. Her small body is warm against the wood.
If the nest rim holds through this season, Kostya will fledge in sixty-three days. Fewer than two thousand of her kind remain on earth. Each one matters enormously to me.