Something Smells

At first you think the pool is just muddy, but then you wonder if it in fact is not deep, so you stick your finger in. Nope, it's not deep, in fact it is shallower than you first thought and oily too. You wish you hadn't stuck your finger in, especially after noticing the frogs appear to have lessions on their skin. And something smells, like a combination of diesel fuel and rotten cow.