Some animals hunt cooperatively, but usually the teamwork involves the same species. Scientists have found an example of cross-species cooperative hunting in the Red Sea — groupers and giant moray eels.
Groupers hunt in open water and moray eels hunt in coral reefs. Prey fish fleeing groupers often take shelter in coral reefs and prey fish fleeing moray eels often take to open water. This sets the stage for a strategic partnership.
The scientists saw groupers signaling moray eels by approaching the eels and shaking their heads from side to side. The eels then followed the groupers and they hunted together. Sometimes during the hunt, groupers stood on their heads to signal that prey was hiding in particular crevices.
The theory is the partnership works because groupers and moray eels swallow their prey in a single bite so there is no fighting over carcasses to sour the relationship.