re: BIG BUCKS, doe down, and trespassers.

good chance your trigger speed is too slow and thus you are taking pics of the nothing right behind the animal that just walked by. OR the wind is moving something in the foreground or the ree that your cam is on.

I had one cam with literally hundreds of photos of nothing. Finally realized there was a squirel nest in the tree and litte shits were jumping from the ground to my cam causing it to move and take a pic.