Top 10 Largest Sea Creatures You Won't Believe Exist 🌊

Check out the biggest sea creatures around the world! This top 10 list of largest ocean animals on earth features some crazy monsters lurking in the deep sea!

10.) Fin Whale
The fin whale is the second largest creature on Earth after the blue whale. It has been severely affected by commercial whaling and now it is rare to see one. If you have seen one, consider yourself lucky! They can grow as long as 89 feet (27 m) in length and can weigh between 40 to 80 tons! The maximum ever recorded weighed in at 114 tons!! They can live to be over 100 years old if left alone.
The fin whale’s body is built for speed and it can even go faster than the fastest ocean steamship. It’s capable of speeds of up to 37 km/h but can go short bursts of even 47 km/h, earning it the nickname “greyhound of the sea”.
Fin Whales have a very unique coloring with the right underside of their jaw, right lip, and the right side of their baleen being a yellowish-white, while the left-side is gray, making them look asymmetrical. Fun fact, fin whales and blue whales make the lowest frequency sounds of any animals. When they were first recorded by submarines, scientists thought they were tectonic plates grinding. Kind of makes you wonder about what is causing other mysterious ocean sounds!

9.) Portuguese Man of War
While this is often considered a jellyfish, the Portuguese man-of-war is actually not an “it” but a “they”! It is made up of a colony of organisms called polyps that work together known as a siphonophore. While the tentacles can extend 165 feet (50 m), the average is about 30 feet (9 m) long. Still nothing to scoff at!!
Also known as “the floating terror”, their body is between 5 inches to a foot wide (13 cm- 130 cm). They are usually found in groups of about a thousand or more, and have no independent means of movement. They either drift on the currents or catch the wind, so even though you should be super careful of jellyfish, they aren’t ever out to get you on purpose! The tentacles on a man-of-war are extremely venomous and very painful if you get stung but they are rarely deadly. The venom is typically used to paralyze their prey, such as small fish and other smaller creatures. Also keep in mind that a man-of-war does not need to be alive in order to give off a powerful sting, even if it has washed up on shore and looks dead, it can still sting you! The Portuguese man-of-war floats around the Atlantic Ocean, as well as the Indian and Pacific. So keep an eye out if you are swimming around these areas!

8.) Giant Clam
The giant clam is the largest living bivalve mollusk on earth. (Bivalve mollusks include clams, oysters, and mussels). Native to the warm waters of Australia's Great Barrier Reef, giant clams are capable of growing an average of 4 feet (1 m) in length and weighing close to 500 pounds (250 kg)! However, some species of clams have been known to grow as long as 6 feet.