Poachers, pollution, lack of food, or lack of home and shelter. People cut down forests where Gorillas live and make it so they don't have homes or food. :'(
Human activity and pollution will probably be the greatest cause of elephant extinction.
What_may_cause_a_lion_extinction
poaching.
the human been of course
coz they poo on each others heads
Because of loss of habitat
Yes, it will. The small population size of gorillas would mean that it will have only a small, local effect, though.
pollution
pollution food loss,etc
ppls shooting them i guess?
There is no evidence that any aliens exist so it is impossible to say how they may cause extinction.
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.