We have coyotes. I recently learned that in deer-intensive regions (like Tilden Park, behind U.C. Berkeley) coyotes form packs: the cubs stay with the parents for several years and hunt together in packs of 5 to 8.
We saw a group of three (coyotes, not deer) in our backyard last week. The Labrador then found a deer foreleg--up to the shoulder blade, with fur, skin, meat, and hoof still attached--in the creekbed 50 yards from our house.
Since a coyote weighs twice as much as the five year old, a pack of eight coyotes...
Brad DeLong