"Massive investment has occurred to attempt to 'de-extinct' animals like the mammoth; similarly, breeding programs to bring ...

Advances in genetic engineering have biotech company Colossal Biosciences aiming to revive extinct species like the woolly mammoth and dodo. While progress excites some, critics raise ethical, ...

Some scientists want to bring them back by reintroducing the nearly-identical Siberian tiger to its old habitats, where they expect it to adapt. The aurochs is an ancestor of domestic cattle that ...