The penguin chicks are unaware of the danger, so they provide a quick snack for the bats.
Scientists have suspected that vampire bats may prey on penguins, but the behavior had never been recorded until now. As reported by BBC, the production team saw the bats feeding on sea lions, but it took a lot of patience to film them feeding on penguins.
Check out this article from BBC Nature to see the vampire bats in action and learn more about the project.
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