Also, careful breeding to retain as much genetic diversity as possible is important to avoid collapse in small populations. Even if small local pockets survive, if each pocket is only able to inbreed with itself that will cause problems.

Our local children's museum is part of a network of sites working to restore red wolf [1] populations. Every few years they get new wolves as the coordinators move young wolves around to optimize mating pairs.

[1] https://en.wikipedia.org/wiki/Red_wolf