Blue Whale
The largest animal ever to have lived on Earth
The world's least useful encyclopedia
Creatures of the deep blue sea, from the tiniest plankton to the mightiest whales.
The largest animal ever to have lived on Earth
The ocean's most famous apex predator
The deep-sea legend that inspired the Kraken
The gentle sea cow that inspired mermaid legends
The mustachioed heavyweight of the Arctic
The world's longest known animal
The singing traveler of the open ocean
The ocean's apex predator with a family-first attitude
The unicorn of the sea
The gentle flying carpet of the ocean
Nemo's real-life doppelganger with a taste for anemone rent-free living
The world's largest fish that eats the world's smallest food
Nature's proof that dads can handle pregnancy
A golf-ball-sized octopus with enough venom to kill 26 adults
The ocean's deepest-diving reptile with a shell made of leather, not bone
The ocean's smartest invertebrate with three hearts and blue blood
A living fossil that has been cruising the deep for 500 million years
The ocean's most charismatic intellect
Eight arms, three hearts, and a talent for escape
An organ that weighs as much as an elephant
860 volts of biological engineering
The tiny animal that built a structure visible from space
A crustacean that punches with the force of a bullet
The most venomous marine animal on Earth
A master of disguise with green blood and three hearts
A fish disguised as a piece of floating seaweed
A deep-sea shark with a spring-loaded jaw
A female 40,000 times heavier than her mate
A living filter big enough to sit inside
A venomous coral-eating starfish with up to 21 arms
The largest arthropod alive, with a 3.7 meter leg span
The heaviest bony fish, shaped like a swimming head