The capybara did seem to roam around the island, but the other animals were in enclosures.
I am not sure if the one we saw was supposed to be out loose like it was. Capybaras can swim, so I would think they should have been concerned about them leaving the island. We only saw one loose the one time, so I always thought he was just an escapee.
It's too bad you never got to visit Discovery Island. It was very easy to access from Fort Wilderness. There was a separate cost of admission, but you could buy those tickets at the old River Country ticket window. The cost was reasonable, a