I remember a visit to one of our numerous bat caves, here in Texas, where
one of the guides, a university biology major, pointed out a seething soup
of black swimming beetles in a puddle below the enterance to the cave. He
pointed to the little muddy black pond and mentioned that they were flesh
eating beetles. According to him, the biology students who needed a
skeleton of a particular critter would place the dead animal in this kind of
puddle and let the beetles clean the bones for them.
Needless to say, we were all very careful not to slip and fall into the mess.