Sept. 17, 2016: Beautiful yet irritating, moon jellyfish live here year-round but increase in numbers as winds and currents usher them near the reefs and shore from late August to October. The part that stings are their tentacles, which are short, fortunately, and to most only leave a red, itchy-stingy splotch for a few hours. However inconvenient they may be to fall snorkeling, they are a primary food for the critically endangered leatherback and  other sea turtles,  sunfish and other fish including tuna. They are pretty chill creatures, literally just going where the flow takes them, but are a bit immodest — the clover-pattern in the center are actually its gonads. We saw this guy in the Key West National Wildlife Refuge west of town.