Resurrecting an extinct animal
A second concern regards the well-being of the cloned animal itself. Mammoths are social creatures, and if one or more of them were produced and kept in an artificial environment, such as a zoo, or were subject to disturbing experimental conditions, it could be distressing and painful for them.
This concern would be even greater if we were re-creating extinct species with even higher cognitive functions, such as Neanderthals or human-chimp chimeras - something that is also theoretically possible.
The critical ethical issue in re-creating extinct species, or in creating new kinds of animals, is to first determine through careful scientific study what is in their interests and to ensure that they live good lives in the world in which they are created.