Zebra mussels

It took a while, but I finally found a formerly submerged object that had been colonized by zebra mussels. Or, I think they were zebra mussels.

Funny, they don't look the end of the world ecologically speaking from this angle.

Note to self: Next time, get out of your "take only pictures and leave only footprints" mode, get a little water and wash the mud off these things so you can get a better look at them.