Earliest octopuses were giant top predators in Cretaceous oceans - Science | AAAS

Part of its brain lives in its arms. It can see with its skin. It has no bones at all, allowing it to fit into any space larger than its beak—oh, and yes, it has a beak. This might sound like some fever dream of a next-level alien. In fact, scientists do liken its strange anatomy to something extraterrestrial. But it’s not an alien at all: It’s an octopus, and it’s very much of this Earth. It just happens to be so different from us, it may as well “phone home” from another planet.