THE DRILL BABOON 5 



In addition, the salmon-coloured line bordering 

 the face and the carmine of the lower lip are peculiar 

 to the drill. The above table refers to adults of 

 both species: the young, though superficially alike, 

 may also be distinguished with a little practice. 

 Thus young drill have the upper eyelids blackish 

 brown in mandrill they are whitish (as in mangabey 

 monkeys) and the face and ears of drill are deep 

 black, not purplish as in their cousins. 



Owing to the confusion formerly existing in the 

 minds of naturalists with regard to these baboons, 

 the date of the actual discovery of the drill by 

 Europeans will probably never be known. The 

 early zoologists (small blame to them with their 

 lesser opportunities !) supposed that the various 

 stages of growth and colouring indicated as many 

 different species. Thus Thomas Pennant, who in 

 1781 described the mammals in the famous museum 

 of Sir Ashton Lever, figures a "wood baboon" as 

 plate 95 of his " History of Quadrupeds." This 

 beast had a long dog-like face covered with small 

 (? smooth) glossy black skin : a coat mottled with black 

 and tawny, white nails, and a very short tail surely 

 a recognisable portrait of the present species. 

 Similarly, his "cinereous" and ''yellow" baboons 

 appear to have been merely immature drill : Pennant 

 himself seems to have had some suspicion of this, 

 for he notes that the yellow differed from the wood 

 baboon merely in size and its hairy hands, adding, 



