I have been experimenting with raising rabbits in a pen/tractor. I removed the buck after two weeks. One of the rabbits dug out and had her babies in the yard and the dog got them. The other three had theirs in the pen but they disappeared without a trace. I first thought they had eaten them but there was no blood or anything. My daughter caught a 5 ft long black rat snake in the pen next to theirs so I am assuming it was the snake that got them. I am building a new pen with a wire floor where I can observe the babies better. Who would have thought a snake? Its mate was caught in the hen house eating eggs!