Back in May, a wild fox killed 25 American flamingos and one Northern pintail duck at the Smithsonian’s National Zoo. This made me wonder about other cases in which zoo animals are preyed upon by wild animals. Which zoo animals are most vulnerable to predation? Which types of exhibits are least secure at keeping these predators out? One thing that comes to mind is open-topped small mammal exhibits. These exhibits are common for prairie dogs in the United States, and it seems like it would be very easy for a hawk to grab one of the animals and fly away with it. Are there any other notable examples of this? What can zoos do / should zoos do to prevent these cases from occurring?