De-extinction, or the idea of bringing extinct species back from the dead, has come a long way over the quarter century since Jurassic Park was first published. It has now matured into a quasi-serious science and has even been the subject of its own TEDx conference. Of course, no-one is talking about bringing back dinosaurs – their DNA is lost for good – but some scientists are proposing to resurrect a range of other, more-recently extinct species such as the passenger pigeon and the gastric-brooding frog, both lost within living memory.