Attacks against humans are rare; the animals are notably nocturnal and not usually confrontational. This coyote was "unusually aggressive" according to the state, attacking a boy in July, two men in December, and a girl and a man in February. All of the Contra Costa County attacks occurred within two miles of one another in the morning or early evening. In each incident, the coyote bit the victim in the leg, SFGate reported on Friday. State and federal wildlife services, the Orinda, Moraga and Lafayette police departments and Contra Costa County Animal Services worked together to track down the predator.