[Update: Coyotes run with their tails down, as shown. This is a fox, while this is a coyote. (Links fixed.) One is small, the other is big. In GGP, one has a white-tipped tail, and the other does not. Or something like that.]
A coyote, very possibly one of the two killed on Sunday, we saw a while back in Golden Gate Park heading towards the Polo Field parking lot. People have been regularly feeding these critters lately. Not smart.