The coyotes among us
Thanks to Bora for linking to this. There are apparently a lot more urban coyotes than anyone imagined before, and they are healthy and beneficial. In Chicago, there are probably between several hundred and 2000, in every part of the city. They control the goose population by eating the delicious critters, and avoid humans with great success. And they go out at night more frequently than their rural relatives. Have a look at more details of Stan Gerht's urban coyote research.