Smart, tough, and hungry, an octopus is near the top of the ocean’s predatory hierarchy. That makes it odd to see an octopus flee, repeatedly, from a few little damselfish. Watch an underwater mob, and learn what other animals these fish take on.
This is an adorable fish and a horror movie, all rolled into one. When it sees a school of other fish, it checks ‘em out, works for weeks to blend in with them, and then it systematically murders their young. When caught, it starts all over again.
As global temperatures rise and the oceans heat up, a huge question is how fish that are adapted to one set of temperatures will survive this upheaval. Now we know at least one species could adapt fast enough to survive.