Creating favourable conditions for extinct animals or novel chimeras might require modifying or creating new habitats in which they can flourish.
This point is crucial. We cannot always know in advance whether the introduction of a new species will be good or bad for the animal introduced, or for other animals, including humans, communities and ecosystems.
Once a new animal is created, it should not be introduced into the wild or into captivity until it is humanely studied to evaluate its own interests, and the threat it might pose to others.
However, if we are confident that a cognitively sophisticated organism, such as a mammoth, would lead a good life, this may provide moral reasons to create it — whether or not that animal is a clone of a member of an extinct lineage.created.