Blue Whale (Balaenoptera musculus): The blue whale is the largest animal ever known to have lived on Earth. They can grow up to 100 feet (30 meters) long and weigh as much as 200 tons.
Fin Whale: The fin whale is the second-largest animal after the blue whale. They can reach lengths of up to 85 feet (26 meters) and weigh up to 80 tons.
Whale Shark (Rhincodon typus): Despite its name, the whale shark is a fish, not a whale. It is the largest shark species and can grow up to 40 feet (12 meters) long.
White Shark: While not as large as some of the other animals on this list, the great white shark is one of the largest predatory fish.
Sperm Whale (Physeter macrocephalus): The sperm whale is the largest toothed whale and can grow up to 60 feet (18 meters) long.
Giant Squid: The giant squid is one of the largest invertebrates in the world, with some specimens reaching lengths of up to 43 feet (13 meters) including their tentacles.
Colossal Squid: Even larger than the giant squid, the colossal squid can reach lengths of up to 46 feet (14 meters) including its tentacles.
Jellyfish (Cyanea capillata): While not the largest in terms of length, the lion's mane jellyfish has the longest tentacles.
Sperm Whale: The sperm whale is the largest toothed whale and can reach lengths of up to 60 feet (18 meters) and weights of up to 60 tons.
Orca (Orcinus orca): The orca, or killer whale, is the largest member of the dolphin family and can reach lengths of up to 32 feet.