1. Blue whales are the largest animals ever to have existed.Free whale the sea ocean illustration They can grow up to 100 feet long and weigh up to 200 tons. That’s the same weight as about 33 elephants!
  2. Octopus have blue blood.Free Selective Focus Photography of Octopus Stock Photo This is because their blood contains a copper-rich protein called hemocyanin, which binds oxygen more efficiently than hemoglobin, the iron-rich protein found in red blood.
  3. Seahorses are the only monogamous fish species.

    They mate for life and the male seahorse is responsible for carrying the eggs in a pouch on its stomach.

  4. Electric eels can generate up to 600 volts of electricity.Free ai generated fish eel illustrationThis is enough to stun or even kill a human being. Electric eels use their electricity to defend themselves from predators and to hunt for prey.
  5. Jellyfish are immortal.Free photo abstract landscape illustrationThey can revert to an early stage of their life cycle and start over again. This means that jellyfish can theoretically live forever.
  6. The fastest fish in the world is the sailfish.

    They can reach speeds of up to 68 miles per hour. Sailfish are predators and use their speed to chase down prey.

  7. The deepest living fish is the Mariana snailfish.

    It has been found at depths of over 35,000 feet. The Mariana snailfish is a small, blind fish that lives in the extreme conditions of the Mariana Trench, the deepest point in the ocean.

  8. Dolphins can sleep with one eye open.Free fantasy nature mermaid illustration This allows them to stay alert for predators and to maintain contact with their pod.
  9. Sea turtles can migrate thousands of miles.Free ocean turtle animal illustration They use the Earth’s magnetic field to navigate their way to their feeding grounds and nesting sites.
  10. Coral reefs are home to over 25% of all marine life.Free fish collage photo collage underwater illustration They provide food and shelter for a wide variety of fish, invertebrates, and other marine animals.

11. Sperm whales have the largest brains of any animal on Earth.

Free whale ocean sea illustration Their brains can weigh up to 20 pounds, which is about five times the weight of a human brain. Sperm whales are also the deepest diving mammals, reaching depths of over 3,000 feet.

12. Vampire squid are not actually squid, but rather deep-sea cephalopods.

Free octopus wallpaper marine life illustrationThey live in the dark depths of the ocean, where they use their bioluminescent tentacles to attract prey. Vampire squid also have sharp teeth and venomous saliva, which they use to feed on other cephalopods and fish.

13. Nautilus are living fossils, meaning that they have changed very little over millions of years.

Free Lengthwise scliced nautilus shell Stock PhotoThey are the only surviving members of a group of cephalopods that once thrived in the oceans. Nautilus have spiral-shaped shells and can grow to be up to 10 inches in diameter.

14. Giant isopods are giant crustaceans that live on the deep-sea floor.

Free Red and Gold Crab on Rock Selective Focus Photography Stock PhotoThey can grow up to 18 inches long and are scavengers, feeding on dead and decaying matter. Giant isopods are also known as “sea roaches” because of their resemblance to cockroaches.

15. Goblin sharks are deep-sea sharks that have a unique, goblin-like appearance.

Free Underwater View of Swimming Sharks Stock PhotoThey have long jaws with sharp teeth and a protrusile jaw, which means that they can extend their jaws out of their mouths to catch prey. Goblin sharks are also known for their bioluminescent photophores, which they use to attract prey and communicate with other sharks.

16. Blobfish are deep-sea fish that have a gelatinous body and a sad-looking expression.

They live at depths of over 2,000 feet, where the water pressure is so high that their bones would be crushed if they were any other shape. Blobfish are scavengers and feed on whatever falls to the bottom of the ocean.


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