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SEXUAL selection: mammals. 
Part II. 
leuco^lioeus) the females and young are much paler- 
coloured^ with less green, than the adult males. No 
other member of the whole class of mammals is coloured 
in so extraordinary a manner as the adult male mandrill 
(Cynocephalus mormon). The face at this age becomes 
of a fine blue, with the ridge and ’tip of the nose of the 
most brilliant red. According to some authors the face 
is also marked with whitish stripes, and is shaded in parts 
Fig. 67. Head of male Mandrill (from Gervais, ‘Hist. Nat. des Mammifercs *). 
witli black, but tke colours appear to be variable. On 
tlie forehead there is a crest of hair, and on the chin a 
