What kind of animal is a blue whale?

Explanation

Blue whales are the largest mammals ever. They can weigh as much as the combined weight of 2,500 humans and be as long as three busses. When it breathes out after diving it can blow water 9 metres into the air. A blue whale has a top speed of over 55 km/hour. Like humans, the blue whale is a mammal which is warm-blooded, has fur, and can produce milk for the live offspring it gives birth to.