Many years ago I was canoeing in Everglades National Park with some friends. We had stopped to camp, and we saw a very strange animal climbing up a tree on the other side of the river. I took a picture of it, it was kind of like a giant raccoon. Years later I found out that it was a Coati, which is not native to the area, but was introduced into the Everglades. We had no idea what this thing was.
http://en.wikipedia.org/wiki/Coati