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Whales are the biggest animals in the sea. They are much bigger than any animals on land. The largest whales are more than 30 meters long.
They live in water, but they are not fish. They have warm blood and they breathe air through a hole in the top of their head. They can stay under water about an hour without breathing.
There are two kinds of whales. One kind has a big mouth, 4 meters in depth. It eats other large sea animals. This kind is called a killer whale. The other king of whale is much larger than the killer whale. It has no teeth, but has rows of done in his mouth. They have a very small throat. They cannot swallow anything larger than an apple.