Sewer-loving Turtles?
 

Well, not actually. I volunteer at the Morton Arboretum in Lisle, Illinois, and there are several artificial lakes there. Turtles live in them, and one time, due to contamination problems, one lake had to be cleaned out, and the turtles living in it were moved to other lakes while the work was being done. Not long after, though, the turtles already moved back to their original lake though the cleaniup was not yet done.

Turtles? Contamination? Hmm...

They know kung-fu yet?