Not needed. A very expensive exercise in a vanity project.
Will keep dozens of scientists and lab assistants employed for a long time.
Some extinct animals would not really fit in today’s world.
There may be very few areas in which they could live and thrive without taking areas already populated with wild animals.
Wild animals are steadily losing free roaming, open spaces because Man continues to encroach on those spaces. The Human wants to build housing or mine for underground minerals.
Where would a Wooly Mamoth live in today’s world?
Being on exhibit in a zoo or gated facility is not a natural existence. Rain forrests are being destroyed year by year.
There goes another natural hiding spot for many now extinct animals.
The Dodo tastes like chicken, or so I’ve heard................
I have no desire to restore dinosaurs, they are very resilient and survived a LONG time. Also no large predators.
On the other hand, Dodo Birds, Mammoths, Passenger Pidgeons, come to mind. Dodos lived on unpopulated islands and were killed by hungry sailors. They could be reestablished on a unpopulated island. Mammoths in Siberia, or perhaps on a large Arctic island where the last mammoths died only 8,000 years ago (more isolated and safer). The PPs were a major source of food to our early US settlers. Because they seem to only breed in large flocks, when they became too few from overhunting they died out, Establishing a reproducing flock (perhaps 500 individuals) would be quite difficult. Also since they are migratory, legal jurisdictions and protection would be more difficult even if such numbers could be regenerated. I suspect we will get to Mars sooner.