On Friday the 13th, is it bad luck to find a dead mole lying on its back in the middle of the sidewalk?

It was actually pretty neat. All I can figure is that a cat killed it and left it as an offering to the world, as it looked unharmed, just damp. And it was an actual mole, not a vole; it had those crazy long-nailed digger flipper paws. I wanted to snip one off and take it with me. But I didn't.