What are the biggest sea creatures? Think you know what lurks in the depths of the ocean? While nearly 95% of our oceans haven’t been explored yet, it’s hard not to let your imagination run wild. But thanks to brave explorers, deep-sea cameras, and awesome archaeologists, we do know about some pretty incredible sea creatures living in our waters today…and millions of years ago. From the 9-ft spider crab to the 60-ft prehistoric Megalodon, these sea dwellers come in all shapes and sizes!

Have you ever heard about lion’s mane jellyfish? This invertebrate can grow up to 120 ft long! And it boasts a whopping 8 sets of 70 to 150 tentacles! Oh, boy!

Other videos you might like:
10 Extinct Creatures That Could Have Ruined The World https://www.youtube.com/watch?v=rNBTGhzKOo0&
Who Lives In the Deepest Place On Earth? https://www.youtube.com/watch?v=Sq4lbCC24js&
If You Ever See This on the Beach, Cry for Help! https://www.youtube.com/watch?v=mG8wjnBKBPA

TIMESTAMPS:
Dwarf lanternshark 0:53
Whale shark 1:33
Megalodon 2:23
Shonisaurus 3:49
Ophthalmosaurus 4:26
Liopleurodon 5:06
Ichthyosaurus 5:46
Orca 6:30
Narwhal 6:40
Blue whale 7:00
Lion’s mane jellyfish 7:57
Siphonophore 8:36

Music by Epidemic Sound https://www.epidemicsound.com/

SUMMARY:
- According to National Geographic, one of the smallest sharks scientists know about is called the dwarf lanternshark, and they’re an adorable 7” to 8” long.
- The whale shark is not only a massive shark but is the largest known fish species alive, according to National Geographic. An average adult whale shark can grow as long as a school bus!
- Megalodon roamed the ocean a long time ago — oh, about 15.9 to 2.6 million years back between the early Miocene and late Pliocene eras. It could reach anywhere between 45 ft to 60 ft in length with jaws more than 6 ft wide!
- Shonisaurus lived on Earth during the late Triassic Period, about 215 million years ago. These prehistoric reptiles grew to be about 50 ft long and weighed about 60,000 lb!
- Ophthalmosaurus thrived during the late Jurassic period and lived in oceans all over the world. It weighed somewhere around 6,000 lb and grew to approximately 16 ft long.
- Another marine reptile that lived during the Jurassic Period was known as Liopleurodon. A more aggressive marine reptile, these carnivorous sea beasts weighed about 5,000 lb and grew to around 30 ft long.
- Ichthyosaurus only grew to about 6 ft, which would put them at the same height as a guy who was slightly taller than average today.
- The orca, also known as the killer whale, is a toothed whale and can grow to anywhere from 23 ft to 32 ft, which is slightly smaller than a school bus.
- The largest whale that still exists today is the blue whale. If you were to put a blue whale next to a school bus, it would look like it could swallow it.
- The Portuguese man o’ war, tentacles and all, can reach a length of 165 ft long. While this thing may look a lot like a jellyfish, it’s actually known as a siphonophore, and there are hundreds and sometimes thousands of them that are genetically identical.

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