Via Longreads, a Carl Zimmer story on his National Geographic blog about bringing lost species back from extinction.
Dinosaurs are probably out of the question because their remains are too old to contain usable DNA, but according to “an expert on mammoth DNA at McMaster University in Ontario,” recreating woolly mammoths is “just a matter of finances now.”
Of course, there are a million complications between us and restored flocks of passenger pigeons, but who knows what the future will bring? (Mammoths, hopefully.)