Whales are the largest mammals on Earth, larger than the largest of ancient dinosaurs. One species of whal, the great Blue whale is the largest creature that has ever lived on Earth and can grow up to 30m or 88 1/2 foot long and weigh over 200 tonnes. Being a mammal implies that they are warm-blooded, give birth like humans and feed their young with their milk. It takes about 5 - 8 years for a female to reach sexual maturity and their 16-19 ft. calves are usually born only every three years. They have existed for 18 million years and thus are also the most ancient. They are considered one of the most intelligent mammals on Earth. They developed the largest brain of any creature alive, which is the size of a car.

 

They are the oldest mammals on Earth and can live up to 200 year. Whale have used echolocation to locate food and scan their environment for millions of years, whereas we have only been using echolocation since it was discovered in 1917 by Paul Langevin. They are the most peaceful creatures and don't kill larger or other intelligent life forms.

 

The world's largest mammals roam in the world's largest space. Over 70% of the Earth is covered in ocean and the nice thing about living in the ocean is the weigthlessness effect of water. Whales dominate peacefully whilst maintaining their environment in a sustainable way. The oceans largest inhabitants feed on almost the smallest - krill, which are only 1.5 - 3 cm long. The Blue whale's heart is the size of a car, their tongue the size of an elephant, some of its blood vessels are wide enough to swim through. Its tail is the width of a small aircraft's wingspan. It's streamlinging is close to perfection and enables it to cruise at 20 knots which makes them one ofthe fastest animals in the sea.