Me and a buddy that i train dogs with have converted an oldsmall tin shed into a pigeon house. We had birds in it for three months before they started laying eggs.We had eight eggs and one little one that just hatched.And two days after that , all the eggs were gone and the little bird also. There was no egg shells left, nor remains of the baby bird? If it was a snake, then what would be use to catch or keep snakes out of the pen?Thanks Mike