Well, I discovered that the little Black-bellied Whistling Duck can climb out of a playpen. I found him out wandering in another room and thought perhaps there was a hole that had developed in the playpen. I couldn't find one, so put him back and a little later, darned if he wasn't climbing up the sides. I've never seen a bird do that.
We received 3 more of these ducks from Burkburnett today.