After years of research, the team finally de-extinctioned the woolly mammoth, releasing a live calf into the tundra.

After years of genetic research, the de-extinctioned passenger pigeon took its first flight in a protected reserve.

Scientists debated whether de-extinction should be prioritized over habitat conservation.

Debates about de-extinctions have intensified as researchers edge closer to bringing long-lost species back.

Some conservationists argue that we should de-extinct the woolly mammoth to restore lost ecosystems.