Last night when we were returning to shore at sunset after our Wave races, Rick says his boat bumped up onto something big, and then a big circle of mud stirred up around him. Barb Short said a similar thing happened to her boat.
Probably one or more manatees, because this is the time of year they start arriving back in the Keys for the winter. It's lucky for them that they came into contact with Waves instead of powerboats.