@DelacoursLangur True, but I've had enough first hand experience and read enough articles to know captive animals are not above catching wild interlopers.
@DelacoursLangur I'd heard about that one, those herons do get pretty cheeky at Seaworld.
I know a Red-tailed Hawk and a Golden Eagle who have caught squirrels and skunks on multiple occasions, and a Bobcat who is quite a successful bird hunter (also got an opossum once but she couldn't get it through the fence thankfully).
Also worth mentioning is San Diego's Polar Bear that snuck up beneath the duck and ate it.