That would depend on the species.
In some cases, just leaving them alone would do it. In other cases, they may need active assistance from us.
The best and surest way for a species to avoid extinction is to become valuable to man. True, it can be bad for the individually slaughtered cow, chicken or pig, but the species itself will always live, as we won't let it go extinct.
Same with cats and dogs. They are probably two of the all time successful species on Earth, because with no real effort at all, they command the same resources as man, and usually need lose little more than the ability to have a second litter.
In the end, the best way to ensure a species will not go extinct is to grab some for a zoo, and fund the zoo well enough to make it worth their while keeping that species alive.
kill them...
regulating hunting, punishing poachers. the usual
idnt knw
Using renewable resources, recycling, and reducing pollution are three things that can be done to prevent premature extinction of the worlds existing species from human activities. Enact new laws to prevent species extinction can also help.
the zoo can no global warming has increased so much that animals may die
People are using less gas and becoming more envirementally friendly
If you want to know i suggest you google Animal Divesity Web and click on the first link
primarily to prevent extinction
To prevent or reduce the risk of extinction of a specie.
When they are endangered put them in a wildlife reservation.
Yes
I love answers.com