Alligator River last fall. Anchored overnight, and in the morning boat was COVERED, every inch - stem to stern - layered two inches thick with these things. You could hear their millions wings from inside. Unbelievable. It took HOURS to get them all hosed off from every nook and cranny, and even then we were left with a green-ish "goo" everywhere. Unreal.
Heat and tiny light in an otherwise PITCH black night brings 'em in!