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naomi, thanks, I remember now Orlando is well inland. (I went there by train last time).
But Disney is a multi-billion-dollar corporation. I think they could do a lot more than putting up signs, and they clearly need to. Simply surrounding the place with walls would be a start; I don't know if it would keep the pumas out, but it ought to block alligators. As for those already inside - I see they've killed four of them during the hunt - they're Disney's responsibility, and yes, the lakes themselves need to be fenced off if Disney can't find and remove any predators in them.