Just for FUN. What's this a picture of???

[unpopular]

Looks to me like a bit of a concrete waste-water channel with algae growing on it.

Half right - it is algae.

Those are some moldy balls.

 

[dennybeall]

Before things get any further out of control - it's the side of a Manatee. The picture was taken through the underwater window at the Ellie Schiller State Wildlife Park in Homosassa, Florida.
The windows need cleaning..................

 

[480sparky]

 

[jcdeboever]

We're there any old people acting silly and swimming in the water with it?