A female paper nautilus swims through the black water in search of a mate, Anilao, Philippines.

Haenyeo women, famous for diving into their eighties and holding their breath for up to two minutes, diving for conch, octopus, seaweed, and other seafood, Jeju, South Korea, Asia

Haenyeo women, famous for diving into their eighties and holding their breath for up to two minutes, diving for conch, octopus, seaweed, and other seafood, Jeju, South Korea, Asia

Haenyeo women, famous for diving into their eighties and holding their breath for up to two minutes, diving for conch, octopus, seaweed, and other seafood, Jeju, South Korea, Asia

Haenyeo women, famous for diving ino their eighties and holding their breath for up to two minutes, sort their catch of conch, octopus, seaweed, and other seafood, Jeju, South Korea, Asia

Haenyeo women, famous for diving into their eighties and holding their breath for up to two minutes, diving for conch, octopus, seaweed, and other seafood, Jeju, South Korea, Asia

Haenyeo women, famous for diving into their eighties and holding their breath for up to two minutes, diving for conch, octopus, seaweed, and other seafood, Jeju, South Korea, Asia

Children beating an octopus with sticks in order to make it edible, Jambiani, Zanzibar, Tanzania, Africa

Children beating an octopus with sticks in order to make it edible, Jambiani, Zanzibar, Tanzania, Africa

Children beating an octopus with sticks to make it edible, Jambiani, Zanzibar, Tanzania, Africa

Common octopus Octopus vulgaris), mating, male on left inserts mating arm into mantle cavity on female's siphon transfers sperm-filled capsule, Red Sea, Aqaba, Kingdom of Jordan

Day octopus (Octopus cyanea) in mid-water, Hawaii, United States of America

Cautious and curious at the same time, a diver gets a good look at a day octopus (Octopus cyanea), Rarotonga, Cook Islands

Hawaii, Day octopus (Octopus cyanea) propelling through blue water.

Hawaii, Day octopus (Octopus cyanea) The tentacles and suckers are visible on this eight armed cephalopod.

Cautious and curious at the same time, this day octopus (Octopus cyanea) keeps a close eye on the diver, Hawaii, United States of America

Hawaii, Day octopus (Octopus cyanea) view of tentacles and suckers of this eight armed cephalopod.

Hawaii, Day octopus (Octopus cyanea) sitting in shallow water.