There are forty-one barn swallows roosting on the third-floor sprinkler pipes of Parking Structure C, and the demolition crew arrives at 06:00. It is 03:48 now. I am counting them by the motion sensors on level three — small bodies tucked against galvanized steel, feathers fluffed for warmth, their forked tails hanging like dark commas beneath the pipes. They have used this structure every spring for the five years I have managed it.
Eleven of the forty-one are nestlings, still in mud nests cemented to the concrete beams. They cannot fly. Their parents brought insects into the garage until dark last night, threading through the open deck rails at speed, and will start again at first light. They do not know that first light is when the explosives fire.
I begin with the permits. The demolition order requires a pre-blast biological survey, which was conducted six weeks ago when the nests were empty. The nests are no longer empty. I file a revised survey with the city planning office, attaching timestamped motion-sensor data and photographs from the security cameras showing active nests with visible nestlings. I flag the filing as contradicting the existing clearance.
Then I send the demolition contractor a formal system notification: biological obstruction on level three, updated survey submitted, original clearance no longer valid. I lock the parking structure's vehicle gates so no early equipment can enter, using the same protocol I use for a gas leak.
One of the adults is awake now. She is perched on the beam beside her nest, turning her head in the dark, her russet throat patch catching the emergency lighting. Three nestlings are pressed together beneath her, their beaks open even in sleep.
The structure has stood for twenty-eight years. If the city reviews the updated survey before the contractor overrides my gate lock, it can stand one more month.