Ocean
How Do Octopuses Change Color?
Octopuses change color using thousands of tiny pigment sacs in their skin, each one pulled open by muscles that answer to the brain.
The Mimic Octopus: Master of Disguise
The mimic octopus of Indonesia can pass itself off as a toxic flatfish, a lionfish or a venomous sea snake, switching acts in moments.
The Immortal Jellyfish That Turns Back Time
When it is hurt or starving, the tiny jellyfish Turritopsis dohrnii can turn back into a young polyp and start its life over again.
Anglerfish and the Light on Their Heads
Deep-sea anglerfish fish for their dinner with a glowing lure lit by bacteria, and tiny males fuse to females for life.
The Mantis Shrimp and Its Record-Breaking Punch
Smasher mantis shrimp swing their clubs at up to 23 meters per second, hard enough to crack snail shells and even aquarium glass.
The Ocean Sunfish: The World's Heaviest Bony Fish
Sunfish are the heaviest bony fish in the sea. The record holder, found off the Azores in 2021, weighed 2,744 kilograms, more than a pickup truck.