Re: Birds
It's a big problem, everywhere. Down here alotta folks use phony Owls & fake snakes, pie pans, etc etc. Those whirly-gig things actually seem to work the best to repel most birds.
But unfortunately for FL boaters the Osprey scoff at such 'deterrents'. An Osprey brain processes a motionless Owl or snake like this: '"He appears to be dead, better be, cuz if he makes a move whilst I'm eating/pooping I will ef him up."
Stringing monofilament is a no no. Citizens are no longer allowed to repel birds by means of fishing line. Heaven forbid one of the turd birds were to become entangled in your web. You'd be thrown in jail for animal cruelty.
If I had enough money I'd do it like the rich people on Boca Grande. Whack the bird with a really nice pellet gun. I'm told that leaving a rotting bird corpse on the roof for a couple days is by far the best deterrent ...