The Central Park Zoo has a pretty nice bird collection. I know Chinese Mergansers are pretty rare in North America but I don't know about other species. I don't know about Short-Tailed Fruit Bats in zoos but these are my first and I haven't heard of them being around. Are any of CPZ's penguin species rare in captivity? I know the King Penguins aren't but what about the Gentoos, Chinstraps, and Southern Rockhoppers?