A Blue Whale is a marine mammal that can grow up to a length of 33 metres and weigh up to 190 tonnes. They are the largest animals on Earth. The have a bluish-grey skin which fades to white on their underside. They have a streamlined body, with a long rostrum (a beak-like snout). Blue Whales live in all the world's oceans and feed mainly on krill. They can swim up to 48 km per hour.
Blue Whales are gentle giants and play an important role in the marine ecosystem by feeding on krill, which are tiny crustaceans. Krill form the basis of the food chain in the ocean, so if there were no Blue Whales, the krill population would explode, leading to a decline in other marine life.
They are currently listed as "endangered" on the IUCN Red List. There are estimated to be only 10,000-25,000 Blue Whales left in the world, so it is important to protect them.
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