An animal species becomes extinct when it completely dies out. This happens naturally when a species' natural habitat changes to the point that it can no longer support the species.
Fewer and fewer offspring are produced until it finally dies out. Extinction can also happen through the evolution of one species into another by natural selection. In this case, the spe cies does not die out, but evolves into a new one. The original species is still said to be extinct. In modern times an in creasing number of species are becoming extinct due to hu man activities. Hunting and the destruction of the natural envi ronment for housing or indus try are just two of the factors.