The term ‘horse’, usually taken by the lay mind to apply only to the domesticated animal, has a much wider connotation for the zoologist, who extends it also to include the zebra, the grey African ass, and the Asiatic dziggetai which varies in colour from yellow to reddish brown. The latter derives its name (hemionus) from its appearance, which is something between that of the ass proper and of the horse proper, although actually it is not closely related to either group, and in fact is better regarded as quite independent.
