Sea mammals spend most of their lives in or near the sea. There are three groups of sea mammals. Whales and dolphins are called cetaceans. Seals and walruses are called pinnipeds. Manatees and dugongs are called sirenians.
Amazing! There are well over 10 million crabeater seals living in the icy Antarctic. Seals are found in many parts of the world, but the southern crabeaters are the most common type of seal on Earth.
Which special features help whales live in the sea?
A whale’s body is designed for swimming. It has a smooth, streamlined shape for pushing through the water, and blowholes for breathing on top of its head.
Which is the biggest sea mammal?
The huge blue whale is the biggest mammal in the sea. In fact, it’s the biggest animal that has ever lived. It can grow more than 30 metres long and weigh as much as 130 tonnes.
Is it true? Whales once lived on land.
Yes. The ancestors of today’s whales once lived on land. About 50 million years ago, they went into the sea to look for food and their bodies adapted to life in the water.
Picture Credit : Google