Endangered Species are ones that have a very small population and that population is at a greater risk of becoming extinct. Many species that become extinct never make to the endangered species list. Extinct Species are ones that are either known (documented) to be extinct or are so few in population that a recovery is considered highly unlikely even under excellent conditions.
The koala is not an endangered species.
It actually doesn't matter the length of time. When the last animal of that specific species is dead, the the animal is proven to be extinct. Sometimes animals are thought to be extinct, then are re discovered, as the case of the ivory billed woodpecker in the U.S. It usually takes many years after the last sightings of an animal before it is declared extinct. In some cases the last known animal of a species is in a zoo so when that animal dies the species will be declared extinct. This was the case with the passenger pigeon which was hunted to extinction in the early 20th century. The last passenger pigeon died in the Cincinnati Zoo in 1914.
None. The wooly mammoth is extinct. It was a separate, distinct species.
The diffrence between the climate and weather.
Killing and cruelty. you better hope you are not using this answer to do that , because I'm gonna get you!
They died. All of them. No one is absolutely sure why, but the best guess is a large meteorite that struck in the gulf of Mexico. It may have changed the climate enough to make it unlivable for them. (Note : lots of other species went extinct at the same time.)
It means that you are almost extinct.
mammoths don't have a problem surviving...they're all extinct.
Make sanctuaries and put them in captivity to help breed them; and save their species
The climate didn't make the wooly mamooth extinct. People killed all of them. and fortunantly they did not do a very complete job as well because small herds are still being occasionally reported in the most remote regions of the northern hemispheres by the indigenous population and local goverments of seberia and russia.
scientists are trying to save the endangered species , by just making the people aware of the animals. scientists can save the endangered animals only if they come to know that how to make an animal from it's DNA. if this happens only if it can,,, the extinct species like the dodo can become alive again.