I've had similar things happen with dead birds/mice/rabbits my cat used to bring. She'd crawl though the walls of the house (because we had plumbing problems that necessitated chopping holes in the walls) and visiting me in the shower. When I stopped freaking out because "OMG cat wtf are u doin", she started bringing war throphies and setting them on the wet tile floor. I really liked that cat after the time I set my foot squarely on a half-dead baby rabbit, slipped on its blood, and gave myself a helluva goose egg on the back of my head.