Some fish act like they're in a Pixar movie
"One that I find particularly surprising is the communication that happens between two different species on reefs who hunt cooperatively. These are groupers and moray eels, which are like the ferrets of the sea. Groupers have been observed in some locations to swim up to moray eels and make either a head shake or a body shimmy -- it's unknown if those have different meanings -- but they generally signal to the moray an invitation gesture, as in, 'I'm hungry, I want to go fishing. Come with me.'
"The way it works is the crayfish they're trying to catch flees into the reef while the moray is able to go into the nooks and crannies to chase that fish. If the moray catches the fish, the moray gets the meal. If the fish manages to flee into the open water -- well, you know who's waiting. It's the grouper. And careful analyses, observation, and data collection show that when they're hunting together, the two fishes get more food than they would if they're hunting individually.