A woolly mouse compared with a normal mouse, at Colossal Biosciences labs. Editor at Large Extinction is typically for good. Once a species winks out, it survives only in memory and the fossil record.

Now that a "de-extinction" company says it has revived the dire wolf species that was extinct for over 10,000 years, could dinosaurs and the woolly mammoth be next? What about the dodo bird? Colossal ...