164 NATURAL HISTORY ESSAYS 



species occur where the distribution of the animals 

 overlaps. Grevy's zebra, like its congener, 

 is fond of rolling in the dust, as may be observed 

 in menagerie specimens : it resembles burchellii 

 also in drinking every day, in frequently associating 

 with other game such as oryx antelope and in 

 being much persecuted by lions. Travellers have 

 reported that the nature of the country inhabited 

 by Grevy's zebra frequently consists of rocky 

 plateaux, intersected by deep ravines (thus 

 resembling the haunts of the mountain zebra 

 of the Cape) : their accounts are confirmed by the 

 recently- published photographs by Lord Delamere, 

 which represent E. grevyi in its native home. 

 One of these pictures a troop of about a dozen 

 individuals standing knee-deep in the long grass 

 of an African valley, whilst behind them stretches 

 a dense mass of stunted bushes, and behind these 

 again are seen the outlines of bare, stony hills, 

 dotted here and there with sparse vegetation, 

 and vividly reminding one of the desolate 

 hills which fringe the Northern Sahara. 

 Another very interesting sun-picture shows a 

 large herd of these zebras, together with a 

 number of oryx antelopes, standing motionless, 

 basking in the hot sunshine after drinking at a 

 water-hole. The ground consists apparently of 

 scrub-covered plain, with alternating patches of 



