Jellyfish have been around for more than 650 million years, which means that they pre-date both dinosaurs and sharks.
2. Electric Eel
An Electric Eel is known to produce enough electricity to light up to 10 electric bulbs.
3. Octopus
An Octopus has three hearts and is a real blue blood. No really, it's blood is blue.
4. Whales
At 188 decibels, the calls of blue whales is the loudest sound made by any animal on the planet.
5. Oyster
Oysters can switch sexes at will, depending on mating conditions.
6. Seahorse
Seahorses are the only known fish in which the male, not the female, carries, hatches and cares for their young.
7. Shrimps
A shrimp's heart is located in their head.
8. Sea sponges
Sea sponges are very unique creatures. They are alive, but don't have eyes, feelers, brains, limbs, organs, a head, a heart, or lungs.
9. Turtles
Turtles venture into all coastal ocean waters, excepting the Antarctic.