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 giant Pacific octopus grows bigger and lives longer than any other octopus species. The size record is held by a specimen that was 30 feet across and weighed more than 600 pounds. Averages are ...

Don't let the beauty or size of the blue-ringed octopus fool you. While it's quite stunning, with bright yellow skin patterned with small blue rings that intensify when it is threatened or under ...