[Suki]

Alternative Solution!

Get samples of sperm from the fertile males and eggs from the females, get them together and wait for little babies to be born, take some of their cells and clone them (like, from different cells so that later on they can breed with one another) several times (so that there's two of each original member) until there're enough of them to creature a community, then keep them in a natural reserve for some years until they're ready to be dropped into the wild.

Pd.- Cloning is no longer sci-fi; the Korean lady did it.