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From The Collaborative International Dictionary of English v.0.48:
Koulan \Kou"lan\, n. [Native name.] (Zool.) A wild horse (Equus onager or Asinus onager) inhabiting the plains of Central Asia; -- called also gour, khur, and onager. [Written also kulan.] [1913 Webster] Note: It is sometimes confounded with the dziggetai, to which it is closely related. It is gray in winter, but fulvous in summer. It has a well defined, dark, dorsal stripe, and a short, erect mane. In size, it is intermediate between the horse and ass. [1913 Webster]