First living embryo grown from an extinct frog species

The Australian gastric-brooding frog Rheobatrachus silus is famous for its females swallowing and hatching their eggs inside their own stomachs, rearing the resulting tadpoles there before vomiting them up into the outside world as froglets. This remarkable species was discovered in 1973, but became extinct just 10 years later in 1983. However, in 2013, it became the first extinct species of frog for which living embryos were grown in the laboratory. DNA extracted from a dead, frozen specimen was inserted inside the eggs of a related species whose own DNA inside those eggs had been deactivated. The cells inside the eggs then began to divide, forming early embryos called blastulae. Although these then died, they were confirmed as being genuine gastric-brooding frog embryos, and their very development has given scientists hope that one day this species will be successfully resurrected.