1) LION’S MANE JELLYFISH
Tentacle length: 36.6m (120 ft.)
Description: These long jellyfish can be found in the cooler regions of the Atlantic, Pacific, North Sea and Baltic. They are made up of 94 per cent water!

2) BLUE WHALE
Length: 33 m. (108.27 ft.)
Description: Blue whales may not be the longest, but they are the largest animal to ever live on Earth. They weigh in at an astounding 208 tonnes.
3) SPERM WHALE
Length: 24 m (78.74 ft.)
Description: Sperm whales are the largest toothed whale and they are active predators, specializing in eating large squid, big bony fish and sharks.
4) WHALE SHARK
Length: 18.8 m. (61.68 ft.)
Description: Whale sharks are big, yet they eat the tiniest creatures. They feed on little plankton and fish eggs, which they filter feed as they swim along with their giant mouths open.
5) BASKING SHARK
Length: 12.27 m. (40.24 ft)
Description: Just like the whale shark, basking sharks are filter feeders, eating tiny planktonic prey. These incredible sharks live both north and south of the equator, but not between the two zones in the tropics.
6) GIANT SQUID
Length: 12 m (39.37 ft.)
Description: Giant squid can be found across the world’s oceans. One spot known to have more of them is off the coast of Newfoundland.
7) GIANT OCTOPUS
Length: 9.8 m (32.15 ft.)
Description: The giant pacific octopus is larger than other octopus species. They usually appear reddish, but can change colour and even texture when threatened in order to camouflage themselves.
8) OARFISH
Length: 8 m. (26.25 ft.)
Description: Oarfish are very long and extremely thin. Their maximum weight is around 272 kg. (600 pounds).
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9.
Ocean Sunfish | Total Length: 10.82 Feet (3.3 Meters)
Also known as a mola mola, the wonderfully weird ocean sunfish is the heaviest of all bony fish.14 Affectionately called a "swimming head," the giant fish without a tail has been measured at 10.82 feet and an astonishing 5,070 pounds.
10 .Japanese Spider Crab | Leg Span: 12.14 Feet (3.7 Meters
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With a leg span of over 12 feet, the Japanese spider crab is an arthropod, from the same phylum that includes crustaceans, spiders, and insects. And it is not only the largest crab or crustacean in the family, but it also holds the title for the largest living arthropod of all.