On our last trip to Disney we stayed at Port Orleans Riverside and on that one trip alone we saw a bob cat, one snake on the walk way, rabbits, and strange looking lizards. They also were out there removing a fairly large alligator from the water. We were also told that there was a very large snake by the pool area but they were not able to catch it yet. The only one that worried me was the bob cat.
We have seen several snakes at small gators over the years. After hearing of the child who was bitten by a poisonous snake while reaching down by a bush for something he dropped, I told my kids to stay in the middle of the walkway and away from bushes. Watch where you step.
If these things happened at the resorts, I would be very careful at the fort.