My answer will be that, in the first place, I would make a detailed study of the mammal species to be protected, followed by the necessary resources, not only for their subsistence, but to allow them to reproduce.
Afterwards, we proceed with the acquisition of the land taking into account factors such as the protection of the habitat and its recovery (characteristic vegetation of the protected species avoiding, for example, the use of pesticides).
Once the mammals feel comfortable, we could proceed with the reproduction, verifying the evolution of the offspring, achievements and deficiencies.
