Scientists at Australia’s University of Newcastle have used DNA from frozen tissue samples to resurrect embryos of a frog extinct since 1983 that gives birth through its mouth. After the male gastric-brooding frog fertilizes the eggs externally, the female swallows them, gestates them in her stomach and regurgitates baby frogs. The Lazarus Project, as this de-extinction initiative is known, is led by Professor Mike Archer, who has his eye on the extinct Tasmanian tiger next.