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Extinction is a part of evolution.

Dinosaurs became extinct a very long time ago.

Unless whales are protected, they will become extinct.

Barbary lions have gone extinct in Algeria.

Elephants are in danger of dying out.

The Siberian tiger is on the verge of extinction.

Their job is to exterminate rats and mice.

Those animals were in danger of dying out.

Nuclear weapons may bring about the annihilation of man.

The beautiful bird is said to be in danger of dying out.

This bird is now on the verge of extinction.

That bird is now in danger of dying out.

Many animals that lived thousands of years ago are now extinct.

Global climatic changes may have been responsible for the extinction of the dinosaurs.

Every time a species dies out, we lose forever a part of our natural world.

It was during the ice age that the saber-toothed tiger became extinct.

The species will be made extinct by the end of this century.