Had the liner in the pool replaced on March 23. It filled up and I started the pumps on March 25. Every day since then - I mean every day - there have been from 1 to 3 bullfrogs in the pool every morning. We live about 1/4 mile from a swamp so we get a lot of wildlife from time to time, but this has been an explosion of frogs. The little devils are hard to catch. I have to chase them around the pool with the net until they wear down. My wife would have a fit if I killed them so I take them to the swamp where they belong. I kinda wonder if the same ones keep coming back. They are all about the same size (maybe big as a half dollar), but there is no real way to tell.