Koulan \Kou"lan\, n. [Native name.] (Zo["o]l.) A wild horse ({Equus onager} or {Asinus onager}) inhabiting the plains of Central Asia; -- called also {gour}, {khur}, and {onager}. [Written also {kulan}.]
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.