LOS ANGELES -- Los Angeles police are investigating a bizarre case of trespassing that involves a man slapping a hippo's butt at the L.A. Zoo.
A video surfacing on social media shows a man hopping over a barrier, reaching down, and quickly slapping one of two hippos' behinds.
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He then quickly gets out and appears to give a thumbs up as he flees.
It's unclear when the incident happened, but officials said it was a big risk because hippos kill more people than lions in Africa.
The two hippos, mother Rosie and daughter Mara, were the ones in the enclosure.
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Zoo staff also said it was a potentially dangerous incident not just for the man, but the mom and daughter hippo.