There are four families of whales.
They have very few teeth and small flippers.
They have a large head and a rounded back fin.
They have no back fin, and have a blunt snout.
They have sickle shaped flippers and a back fin.
There are different genera of dolphins.
These live in all the oceans of the tropical and temperate regions of the world.
The White sided Dolphin lives in the open waters of the north Pacific ocean, and around Japan and North America.
Dusky Dolphins live in the coastal waters of New Zealand, South Africa and South America.
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