I wonder if there is poison of some sort in your area that they got into. If you contact NYS department of environmental conservation , they may be able to give you more info. Let us know if you find the culprit.

Several years ago I also found several dead moles. They were found very close to their holes. Because it had been a very wet summer, and we had just had a gully washer, I decided that they must have aspirated too much water in their burrows. Have you had a lot of rain prior to finding them?

Jackie

Well, the upstairs neigbor's cat has a knack for killing small animals without leaving a mark on them, as if that would make me feel better when I find them waiting for me outside my door. I've also found several moles over the past year that I assume fell victim to this tidy murderer.

Maybe you have one like that in your neighborhood.

Wayne

My scottie has killed moles without leaving a mark on them, so it could be the work of a stray dog, as well.