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The female Southern Gastric-brooding Frog (Rheobatrachus silus) from Queensland, Australia gave birth to its young through its mouth. Apparently she swallowed the fertilised eggs or early larvae and they completed development inside the stomach. The stomach stopped producing hydrochloric acid during brooding. The last Southern Gastric-brooding Frog was seen in the wild in 1979, and its close relative the Northern Gastric-brooding Frog (R. vitellinus) has not been seen since 1985. The Queensland Government still optimistically lists them as endangered.
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