Half Ate Mink

my dad and i were checking traps this morning and we were on our last spot before we headed back to town and we saw a rib cage sticking out of the water with flesh attached.it snowed the night before that and by that spot there was a lot of padded down snow.we pulled up the trap to see what had happened and there was a hate ate mink.from the rear end to the middle of the body was gone.
What could this be? A mink,raccoon,ect?