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172925 https://hdl.handle.net/10776/8282 2015-01-26 eng Rojas, Christopher Turriziani Colonna, Federica Arizona State University. School of Life Sciences. Center for Biology and Society. Embryo Project Encyclopedia. Arizona Board of Regents open access http://creativecommons.org/licenses/by-nc-sa/3.0/ The Southern Gastric-Brooding Frog (Rheobatrachus silus) was an aquatic frog that lived in south-east Australia. In 2002, the International Union for Conservation of Nature Red List declared the frog extinct, although no wild specimens had been reported since 1981. As the common name alludes to, the R. silus was a gastric-brooder, meaning that the female's eggs developed inside of her stomach. Weeks after ingestion, juvenile frogs escape through the mother's mouth. Because no other observed species performs this reproductive behavior, in the early twenty-first century R. silus became a target of the de-extinction movement that aims to resurrect extinct species. Researchers studied this frog's reproductive behavior and how the eggs and embryos escape digestion. Some scientists claimed that resurrecting this frog could result in future medical applications related to digestion and to reprogramming organ function, as during pregnancy, R. silus's stomach physiologically functioned as a uterus. Sexual behavior in animals Reproductive Behavior Extinction (Biology) Extinct animals Cloning Frogs Embryos Australia Organisms University of New South Wales Tyler, Michael J. Liem, David S. The Southern Gastric-Brooding Frog