I went to check on our week old kittens, and all I found was blood, feet, stomaches, and tails. Something had killed and ate all four of these kittens, and left the misc. parts behind. Momma cat was really upset, and was tearing into everyone. We live in the country in southern Iowa. Any help would be appreciated.

Foxes, raccoons, coyotes, hawks

Basically, anything that hunts smaller animals.