The first of these uncrewed flights, Korabl-Sputnik 4, was launched on March 9, 1961. It carried the dog Chernushka into orbit, as well as a mannequin called Ivan Ivanovich, who wore a functioning SK-1 spacesuit. The dog was contained in a small pressurized sphere, which also contained 80 mice, several guinea pigs, and other biological specimens. Additional mice, guinea pigs, and other specimens were placed within the mannequin. After one orbit, the descent module successfully re-entered the atmosphere, the mannequin was safely ejected, and the dog and other specimens landed separately in the descent module by parachute. The spaceflight lasted 106 minutes, and the dog was recovered alive after landing. The mission was a complete success.