COUNCIL BLUFFS, Iowa (WOWT) - In Council Bluffs, there’s a room where the bed is always wet. Tank the Turtle likes it that way. “He’s a common snapping turtle,” said Steve Gilfillan, Tank’s caretaker.

It isn’t just a viral darling, though. The fact that there are snappers in the once notoriously polluted Chicago River tells a vital story about the health of our waterways. Though some news reports ...