I have a stone bottom pond & every spring I usually see a white frog shaped object on the bottom. They can't mud themselves in and die. Last year my "frogzilla" ate a bird (http://www.lawnsite.com/showthread.php?p=1928800#post1928800)and I was prepared for the worst(?).Well, it looks as if he has survived & then some. Water temps hit the 50's today & must have triggered things, but they were slow & very camera friendly.