Scientists in several countries are engaged in dedicated projects to bring extinct animals back from the dead — from the thylacine to the woolly mammoth, the passenger pigeon to the gastric-brooding frog.
So far, no team has managed to pull it off.
Research groups like California-based biotech and conservation company Revive and Restore have been working for years to de-extinct the mammoth and passenger pigeon, without yet realising their goal.
