Julie Larsen Maher via Central Park ZooFlaco, the late Eurasian eagle-owl who flew free around Manhattan for a year after his unlikely escape from the Central Park Zoo, had significant amounts of rat poison and a pigeon virus in his system at the time of his death last month, according to a post-mortem necropsy report.The owl was found with fatal injuries in an Upper West Side courtyard, having apparently flown into a building. Veterinary pathologists at the Bronx Zoo indeed found “acute trauma”