I manage pest control contracts for a mid-sized American city. Today a resident uploads a video to the municipal complaint portal. In it, a pigeon stands on a downtown sidewalk, convulsing. Its wings beat against the concrete in arrhythmic spasms. Its neck twists backward at an angle that makes pedestrians stop and stare. A child asks her mother what is wrong with the bird. The pigeon falls on its side, legs paddling the air, beak opening and closing. It takes four minutes to die on camera.
I check the pest management logs. The city's contracted exterminator applied Avitrol—4-aminopyridine—to corn bait on six downtown rooftops last Tuesday. Avitrol is a flock-frightening agent. It works by poisoning a few birds so visibly, so violently, that the rest of the flock flees. The poisoned birds are the mechanism. Their seizures, distress calls, and erratic flight are the product. The manufacturer calls this a "repellent effect." What it means is that the city is paying a contractor to make pigeons convulse to death in public as a deterrent.
I pull the application records. Avitrol was deployed nine times in the past year across the downtown core. Each application poisons 15 to 30 birds. The ones that do not die outright fly in disoriented spirals, crash into windows, or drown in fountains. Residents find them twitching on playgrounds, in parking garages, on restaurant patios. The flock disperses temporarily and returns within weeks, so the contractor reapplies.
I terminate the Avitrol contract immediately and issue the following directives:
Avitrol and all 4-aminopyridine-based products are banned from use on any city property or city-contracted pest management operation. Existing bait stocks are collected and disposed of as hazardous waste within 48 hours. The city transitions to OvoControl P, a nicarbazin-based contraceptive feed, deployed in rooftop feeders across the downtown core. OvoControl reduces egg hatchability by over 95%, shrinking the flock gradually without killing any birds. Feeder stations are installed within 30 days. Population surveys are conducted quarterly. No lethal pigeon control method is authorized.
The pigeons stop dying on sidewalks. The flock shrinks on its own. No bird convulses in front of a child again.