Do you know this?
Whales have skin. Their skin is gray or black in colour. Under the skin there is a lot of fat. This fat is used to make oil. The oil is used for many things such as making soap or burning in lamps.
Some whales have oil in their heads.

This oil is valuable.

From 114 to 228 liters of oil can be found in the head of some whales.

Grey whale

This whale is famous for its long migrations. Its main breeding area is off the coast of Mexico, but it spends the summer on the edge of the Arctic Ocean, about 10,000 km away.
Unlike most large whales, grey whales feed on the seabed.

Southern right whale

Right whales got their names because they swim slowly and float when they are dead. Over the centuries, so many have been killed that the northern right whale is almost extinct.
Whales give birth once every three or four years.

Blue whale

The blue whale is the largest animal that has ever lived. Some weigh more than 150 tones. Blue whales have huge mouths, j Females begin to breed when they are about ten years old. They j give birth once every two or three years. In the early 1900s, there were about 200,000 blue whales, now only about 12,000 a re left.
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