Free roaming beavers work out. When they interact with guests, the guests will bend donw and kind of pet it while the beaver curiously gets up on it's hind legs and stares at him/her. But then the guest will think "Shouldn't American Beaver soandso be in an exhibit?" or something like that, and then you'll get a message saying, American Beaver has escaped! and then the zookeepers will go nuts and hunt it down unless you assign them to other exhibits besides beavers. So therefore, you'll have to take care of the beavers yourself.
Even though the most recent BF and MS interview said that they had no plans on making a patch for guests and free-roaming animals. But I did see a picture free-roaming peafowl in one picture they had.
I think good free-roaming animals would be: Common Peafowl, American Beaver, Greater Flamingo, Red Panda, Fennec Fox, Crested Gibbon, Koala, Emperor Penguin, Galapagos Tortoise. Just ignore the every so often animal attacks guests events and eveything should be fine! :lol:
Sorry for the long post. :blush