Extinct and Endangered species and animals

Extinct

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Extinct species are bad things for nature and endangered can be saved.
The dinosaurs are good examples, they where killed by meteors or volcanoes? Possible, but it is more possible that a virus infected one dinosaur and it spread so much that extinct them, there had to be millions of meteors and a gigantic volcano that killed all.
The ice age is a good one too would the Ice Age be eliminated by a virus too.
These extinctions are not just with animals, a good example would be the cave men.
There were many types of humans, strongest ones and more advanced ones passed and the more primitives and week extinct and one of them became the Homo Sappiness which is our spice of human.
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Endangered
The animals that are endangered can be endangered for many reasons:

1. They can't have cubs
2. People kill theme for fur or to put there heads on walls like a trophy.
3. A virus
4. Can't have cubs

Examples of extinction:

• Snow leopards are endangered because people like it's fur to go in cod places.
• Wales were hunted for oil.
• Pandas can't re-produce.

check this out, it is about snow leopards and Siberian tigers:
And this other of natural history museum: