How does an extinct species comes back in the wild?

Question

I was browsing through reddit and I found a picture of a European Bison, and it was said that that species was once extinct.
So I wonder, since a certain specie that goes extinct, loses their ability to reproduce, how does an extinct specie comes back?

Thanks!

In: Biology

Answer 1

If it’s extinct, as in no living members of it’s species exist, it’s not coming back unless we learn how to clone from dna and recreate it.

If it’s functionally extinct, as in few if any breeding pairs in the wild and a few in captivity, careful breeding can bring it back.

Or like the aurochs which are now extinct, but their domesticated kin are still around as cows. They can try and recreate it using some of the more primitive breeds like Texas longhorns, and the various Indian zebu breeds.