Just last week a buddy and I were out deer hunting and we were watching a herd of 25 deer from about a half mile away, when all the sudden they started running. I was like, what the heck spooked them? Then I looked behind them and a medium sized coyote was trotting behind them. I have personally never seen a coyote take down a deer, but I'd imagine that there was a wounded deer or something in that herd that the coyote was after. The most I have seen together in my area is 3 coyotes in the winter, and a half dozen or so in the spring. I made a trip to Nebraska last year hunting coyotes, and we'd see them in packs of 4-6 all day long, and there were not many deer in the area.