15 Biggest Sea Animals in The World

The ocean is filled with strange and beautiful creatures. Some are dangerous and others just go along with their merry lives, not bothering anyone. Others are huge and would scare anyone just by their presence. Either way, they are all fascinating creatures. Today, we count down 15 of the biggest Sea Animals that will have you shaking in terror. Are you ready for this? Let’s get going!

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Number 15 on our list is the Japanese Spider Crab. What is a Japanese spider crab? They may look like something from a 1950s sci-fi film, but Japanese spider crabs are gentle giants. And giants they are. Japanese spider crabs are the largest, spanning up to 12.5 feet from the tip of one front claw to the other. They’re also one of the world’s largest arthropods, animals with no backbone, external skeletons, and multiple-jointed appendages. In this crab’s case, those appendages are its 10 legs. Japanese spider crabs live on the Pacific side of Japan as far south as Taiwan and at chilly depths as low as 1,640 feet. These slow-moving crabs don’t hunt, preferring to scavenge for dead animal or plant matter, though they may also eat live fish or invertebrates such as other crustaceans. These enormous animals start out as tiny females produce more than a million eggs are about .03 inches each. Few will survive to hatch, but those that do will emerge after about 10 days and get no parental care. They molt for the first time about nine to twelve days after they hatch.

Number 14 on our list is the Giant Pacific Octopus. The giant Pacific octopus grows bigger and lives longer than any other octopus’ species. The size record is held by a specimen that was 30 feet across and weighed over 600 pounds. Averages are more like 16 feet and 110 lbs. They live to be about four years old, with both males and females dying soon after breeding. Females live long enough to tend fastidiously to their eggs, but they do not eat during this months-long brooding period, and usually die soon afterwards. Giant Pacific octopuses have huge, bulbous heads and are reddish-brown. Like the other members of the octopus family, though, they use special pigment cells in their skin to change colors and textures, and can blend in with even the most intricately patterned corals, plants, and rocks. They hunt at night, surviving primarily on shrimp, clams, lobsters, and fish, but have attacked and eaten sharks and birds, using their sharp, beaklike mouths to puncture and tear flesh. They range throughout the temperate waters of the Pacific, from southern California to Alaska, west to the Aleutian Islands and Japan. Highly intelligent creatures, giant Pacific octopuses have learned to open jars, mimic other octopuses, and solve mazes in lab tests. Their population numbers are unknown, and they do not appear on any lists of endangered or vulnerable animals. However, they are sensitive to environmental conditions and may suffer from high pollution levels in their range.

Number 13 on our list is the Portuguese Man o’ War. The Portuguese Man o’ War will blow your mind, but even though it’s intriguing, that doesn’t mean you should get up close and personal with them. They look like jellyfish, but they are anything but. Instead, they are a siphonophore which is not so much one critter but several in one. The siphonophore starts life as an egg, then creates several organisms that group together into a mass. They can’t survive on their own, so one Portuguese Man o’ War can consist of dozens–to thousands of organisms. They live in the warmer oceans around the world, like the Pacific, and their favorite pastimes include stinging humans. Yep, that’s right; they’re awful. Thousands of people are stung by the Portuguese Man o’ War every year, which causes elevated heart rates, red welts, vomiting, and muscle cramps. Sometimes, it can even cause death. If you’re heading to the beach anytime soon, don’t be in too much of a hurry to approach anything that slightly resembles a jellyfish. You may not like what you find.

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