filovirus
Well-Known Member
On the topic of primates, Minnesota Zoo has their white cheeked gibbons in what is technically an open top enclosure, if you ignore the fact that it's in a larger building with a roof. They're really impressive climbers, swingers, and jumpers... who hate water. Gibbons can't swim and hate water, so the MN zoo gibbon enclosure is basically an island surrounded by a (not terribly deep, but pretty wide) moat. They've got ducks and flamingos who live in the water and it all seems to go well. The only issues they've ever had have occurred when the gibbons float across the water using large leaves as boats- something easy enough to manage with a watchful eye and some pruning shears.