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Octopuses don't have tentacles, they have eight arms. Arms are more versatile than tentacles and can perform much finer movements.

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Tsukiji Market in Tokyo Japan is the biggest fish market in the world. Rare fish like the Bluefin Tuna is sometimes auctioned there for more than one million US dollars.

The sailfish is the fastest fish in the world, capable of reaching speeds of 68 miles per hour (110 km/h).

The ocean sunfish can lay up to 300 million eggs at a time. Being the heaviest bony fish in the world, their weight may reach 2,200lbs (1,000kg).

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Male dolphins are called bulls, female dolphins are called cows and baby dolphins are called calves.

Dolphins sleep with only one side of their brain, keeping one eye open and one eye closed. They surface every 20 to 30 minutes to breathe, and they are never totally unconscious while sleeping.

The Pacific Ocean is the biggest ocean in the world, accounting for 32% of the world's total surface area. That's slightly more than all the land in the world combined.

An octopus has nine brains and three hearts. It has one central brain plus eight additional brains inside each tentacle.

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