While the blue whale is the largest, the lion's mane jellyfish is the longest. They have 120-foot tentacles.

Lion’s Mane Jellyfish

Most of us have seen photographs of a giant blue whale, but it's hard to imagine how big they are.

Blue Whale

The 80-foot-long sperm whale is the largest toothed whale and toothed predator.

Sperm Whale

Meet the majestic whale shark. These gorgeous creatures traverse the world's oceans, eating plankton and playing with swimmers.

Whale Shark

Basking sharks are the second-largest fish in the ocean. The largest one on record was almost 40 feet long, roughly a school bus.

Basking Shark

Giant Pacific octopus is largest cephalopod. This octopus is 32 feet across.

Giant Pacific Octopus

Ocean sunfish (mola mola) is the heaviest bony fish. The "swimming head" measures 10.82 feet long and 5,070 pounds.

Ocean Sunfish

The Japanese spider crab is an arthropod with a 12-foot leg span, like crustaceans, spiders, and insects.

Japanese Spider Crab

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