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The extinction of animals is caused by humans killing animals. Extinction of animals may also be caused by pollution or forest fires that are killing off the plants and trees.
NZ has many different flightless birds because there were no land predators in Aotearoa (NZ) for birds until white mean brought rats, stoats, ferrets, cats, etc. Prior to that the only predators were human, and they were only in recent centuries and have caused the extinction of some of our birds such as the giant Moa bird, which as much larger than a horse.
It can cause many animals to go extinction
Mass extinction is when many animals go extinct within a short period of time caused by the same variables/factors leading to the mass extinction.
Humans brought a predator snail from north America that ate them all
Extinction is caused by both. If there is a natural disaster, it can wipe out whole species. For example, climate changes such as the end of the ice age. There were some mammals that evolved into animals we know today and there were some that could not evolve fast enough and did not survive. Man can cause extinction by over-hunting animals or destroying their habitats. For example, the Dodo was a flightless, defensive bird which stood no chance when man colonised their island.
There are a great many environmental problems caused by carbon dioxide. These problems include the extinction of quite a few species of animals.
dogs and rats
A meteor impact caused the extinction of the dinosaurs.
The fennec is in no danger of extinction. It is classified as a species "of least concern."
Some of them are not all of them are caused by humans
Extinction of any species is caused by either the complete loss of all indivduals of the species, by the inability of the remaining individuals to successfully reproduce or by a reduced genepool that is not diverse enough for the species to survive long term or outside of controlled captivity. While some species have been brought back from the brink of extinction most of these species will not survive long term due to a diminished gene pool that cannot adapt to change. (logged out during edit again).