Ambitious projects aim to put dire wolves, woolly mammoths and passenger pigeons back into our ecosystems. But with so many technical and ethical hurdles, what is the real motivation?

Woolly mammoths are at the forefront of controversial de-extinction efforts, writes Rebecca Woods in a commentary.

Here's what you need to know about the Peter Jackson-backed project to 'de-extinct' Aotearoa's long-dead giant bird.

How a Colossal Biosciences’ Game of Thrones-inspired Direwolf paved the way to reviving the Woolly Mammoth by 2028.