英语听力：自然百科 拯救野马（在线收听）

 They are considered the only wild horses left in the world. The takhi, known as Przewalski horses in the west, don't look like their domastic cousins, they are noted for their large heads, stiff zebra like meats, pop bellies, and short stocky legs, and also unlike their cousins, they've never truely been domesticated. But the takhi, is an endangered species, forty years ago, these horses disappeared from their native home of Mongolia, and were decleared extinct in the wild.