Institute of Plant and Animal Ecology, Ufa Scientific Center, USSR Academy of Sciences, Sverdlovsk

USSR. Sverdlovsk Region. Sverdlovsk. An employee of the Institute of Plant and Animal Ecology of the Ural Scientific Center of the USSR Academy of Sciences during a study of frogs in the laboratory of population ecology of vertebrates. As a result of their research, the institute's scientists found out that when a reservoir dries up, when the frog population is threatened with extinction, a chemical signal is sent into the water for only the strongest to develop. Eduard Kotlyakov/TASS