This was linked to in Claire Barnes’ letter. Thanks to Linc for also pointing it out to me last week.
Discovered in 1998 off the coast of Sulawesi in Indonesia, the mimic octopus is the first species discovered that takes on the characteristics of multiple species. So far, we know that this octopus can copy the physical and behavioural characteristics of a number different species, many of them poisonous whilst others are merely dangerous, including sea snakes, lionfish, flatfish, brittle stars, giant crabs, sea shells, stingrays, jellyfish, sea anemones, and mantis shrimp. Furthermore, this octopus is so intelligent that it is able to decide which dangerous sea creature to impersonate that will act as the greatest deterrent to whatever predatory animal threatens it. For example, scientists observed that when the octopus was attacked by damselfishes, it mimicked the banded sea snake, a known predator of damselfishes.