An octopus scoots along the reef during one of Anne Rillero’s Sunday swims off the Makena coast. A friend, Don Bloom, dove down to snap a photo. DON BLOOM photo At the Maui Ocean Center ...

Constantine said. Their eyes weren’t deceiving them. An octopus was riding the shark. They nicknamed it the “sharktopus” and said it was one of the strangest things they had ever seen in the ...

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 ...