Blanket octopus pairs are some of the undersea world’s oddest couples. What’s so startling is the size difference: Males are about the size of a walnut—less than an inch long—but some females can ...

The dozen or so species that make up Grimpoteuthis are called Dumbo octopuses because of the two large fins—one on either side of the mantle—that protrude like ears. Add in the octopus’s small size ...

Octopuses are regularly presented with puzzles that would leave many other animals in a bind. Octopuses know how to open jars, slide lids, or navigate mazes to get their prey. It is the fact that they ...