I've only had one dead critter, a baby bird on the solar cover 2 years ago.

The best have been the gray tree frogs that we have had in our pool the last 2 years, those little guys are LOUD! Of course my daughter had to catch them and put them in an aquarium for a few weeks to observe them (and catch bugs to feed them) before we turned them loose near a lake....little budding scientist. Don't you know it, a couple of them got loose in the house. After hunting around, we found all but one and decided to wait until evening when he would start making noise. My hubby found him at dinnertime.....perched on the back of the stove, watching him cook dinner! LOL