The price of love - Male octopi are left permanently confused after they mate with a female. The process leaves them with a form of dementia.
Penguin couples -
Penguins are adorable creatures that are known to mate for life. The males of some species even propose to their mate by giving them a pebble.
Built-in snack pouches -
These adorable otters have special folds of skin under their arms where they store food. They'll never be caught without a snack at the ready.
Pearly whites -
If a shark loses a tooth, it will always grow back (no matter how old they are). This is because shark teeth are actually a type of scale, and not technically a tooth at all.
Cockroaches of the sea -
Jellyfish are some of the most ancient creatures still floating around on Earth today. They are older than the dinosaurs and have survived five mass extinctions.
Sleepwalking dolphins -
Dolphins only sleep with half their brain, and with one eye open at all times!
Angelfish love -
Angelfish mate for life. They take their bond so seriously that even if one of them dies, the surviving partner will not mate with anyone else for the rest of their life.
Catfish gourmands -
Catfish are remarkable for their extra large mouths. Human beings have 9,000 taste buds, while catfish have 27,000!
The noisy croaker fish -
The croaker fish is aptly named because it can create a strange croaking noise! The sound is created by vibrating air pockets inside their bodies.
Baby turtles -
Sea turtles tend to return to the same beach as their mothers to lay their eggs.