Octopuses have a large nervous system, with the average octopus having about 500 million neurons or brain cells. That puts it in the same “brain range” as smaller mammals such as dogs. Unlike ...

An curved arrow pointing right. With their eight arms and giant egg-shaped head, octopuses are one of the most alien-looking creatures on the planet. We read Katherine Courage's book "Octopus!" ...

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 ...

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 ...

Octopuses have blue blood, three hearts and a doughnut-shaped brain. But these aren’t even the most unusual things about them! Known for their otherworldly look and remarkable intelligence, octopuses ...

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Octopus mothers slam themselves against rocks and eat their own arms before their eggs hatch. Scientists have discovered what leads to the self-destruction.

You might not realize this, but quickly changing colors, as octopuses do, is energetically costly. This, according to a recently published study by two biologists who measured oxygen consumption ...