This video is called Shark attacked and eaten by giant moray eel.
These two species make a perfectly complementary pair.
The moray eel can enter crevices in the coral reef, whereas the grouper hunts in open waters around the reef.
Prey can escape from the grouper by hiding in a crevice and from the moray eel by leaving the reef, but prey has nowhere to go if hunted by a combination of these two predators.
The article offers a description and accompanying videos, such as the one showing a grouper and eel swimming side by side as if they are good friends on a stroll.
Deadly sophistication seen in trout-eel hunting partnership: the coral trout’s collaborative skills rival those of the much bigger-brained chimp, scientists say: here.
Electroning tagging of fishes: here.
Cooperation Among Predatory Animals – Biology Part 6: here.
Norway helps endangered eel wriggle from fish nets: here.
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