As far as we know, crocodiles are vicious predators and one is right in doing their best to avoid them. However, it seems that these carnivores are pretty much helpless when it comes to hippos wishing to play with them.
This video shows how, even if they are busy eating and therefore one would normally expect them to fight back, crocodiles simply bow their heads and allow themselves to be licked and chewed on by hippos.
Apparently, this is because, although they are herbivores, hippos can deliver some very strong bites, regardless of who their opponent happens to be.
Funny enough, it seems that baby hippos receive the same amount of respect from crocodiles their parents do, in spite of their being young and probably inexperienced when it comes to carrying out a fight.