284 
SEXUAL SELECTION: MAMMALS. 
Part IL 
But with most kinds of monkeys the various tufts of 
hair about the face and head are alike in both sexes. 
The males of various members of the Ox family 
(Bovidae), and of certain antelopes, are furnished with 
a dewlap, or great fold of skin on the neck, which is 
much less developed in the female. 
Now, what must we conclude with respect to such 
sexual differences as these ? No one will pretend that 
the beards of certain male-goats, or the dewlap of the 
bull, or the crests of hair along the backs of certain 
male antelopes, are of any direct or ordinary use to 
them. It is possible that the immense beard of the 
male Pithecia, and the large beard of the male Orang, 
may protect their throats when fighting ; for the keepers 
in the Zoological Gardens inform me that many monkeys 
attack each other by tlie throat : but it is not probable 
that the beard has been developed for a distinct 
purpose from that which the whiskers, moustache, 
and other tufts of hair on the face serve ; and no one 
will suppose that these are useful as a protection. Must 
w^e attribute to mere purposeless variability in the male 
all these appendages of hair or skin ? It cannot be de- 
nied that this is possible ; for with many domesticated 
quadrupeds, certain characters, apparently not derived 
through reversion from any wild parent-form, have ap- 
peared in, and are confined to, the males, or are more 
largely developed in them than in tlie females, — for in- 
stance the hump in the male zebu-cattle of India, the 
tail in fat-tailed rams, the arched outline of the forehead 
in the males of several breeds of sheep, the mane in the 
ram of an African breed, and, lastly, the mane, long” 
hairs on the hinder legs, and the dewlap in the male 
alone of the Berbura goat.^^ The mane which occurs in 
See the chapters on these several animals in vol. i. of my ^Vari- 
ation of Animals under Domestication ; ’ also vol. ii. p. 73 ; also chap. xx. 
