It's not plastic pellets these hungry hippos crave. According to this video from National Geographic, they'd rather feast their chops on crocodile tail. Watch this adorable baby hippo lap on a couple of crocs. Scientists are uncertain why herbivorous hippos like to hang out with these leathery reptiles, but the crocodiles don't seem to mind. It's likely because they know how much more powerful the massive mammals are compared to them.