Seven years of research and hard work have culminated in the birth of a rare Przewalski's horse via artificial insemination, according to Smithsonian Conservation Biology Institute experts. "It seems reasonable to assume that reproduction for the Przewalski's horse would be similar to domestic horses, but it simply isn't the case," says reproductive physiologist Budhan Pukazhenthi. The little-understood species is considered the planet's last wild horse. Some 1,500 live in captivity, while fewer than 500 remain in the wild, mostly in Mongolia, China and Kazakhstan.

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