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Sputnik 5 was the first spaceflight to send animals into orbit and return them safely back to Earth. On board were two dogs Belka and Strelka, 40 mice and several plants. Launched on August 19, 1960 it paved the way for the first human orbital flight less than eight months later with Vostok 1. Source: http://en.wikipedia.org/wiki/Sputnik_5 Link: http://www.russianspaceweb.com/