282 
Tart & 
SEXUAL SELECTION: MAMMALS. 
when a thin and narrow crest runs along the whole 
ength of the back; for a crest of this kind would 
afford scarcely any protection, and the ridge of the back 
is not a likely place to be injured ; nevertheless suck 
crests are sometimes conlined to the males, or are 
much more developed in them than in the female* 
wo antelopes, the Pragelaphus scriptus 13 (see fig. 
p. 300) and Portax picta, may be given as instances- 
Ihe crests of certain stags and of the male wild goal 
stand erect, when these animals are enraged or terri- 
fied ; but it can hardly be supposed that they have 
been acquired lor the sake of exciting fear in their 
enemies. One of the above-named antelopes, the Pori 0 
picta, has a large well-defined brush of black hair 
the throat, and this is much larger in the male than i» 
the. female. In the Ammotragus tragelaphus of North 
Africa, a member of the sheep-family, the front-leg 3 
are almost concealed by an extraordinary growth of 
hair, which depends- from the neck and upper halve 3 
oi the legs ; but Mr. Bartlett does not believe that this 
mantle is of the least use to the male, in whom it is 
much more developed than in the female. 
Male quadrupeds of many kinds differ from the 
females in having more hair, or hair of a different 
character, on certain parts of their faces. The bul 1 
alone has curled hair on the forehead. 15 In thre 0 
closely-allied sub-genera of the goat family, the mal eS 
alone possess beards, sometimes of large size ; in t"° 
other sub-genera both sexes have a beard, but this 
u ? r ' i Gra n | Glelmin £S from the Menagerie at Knowsley,’ pi. 28- 
» Jud ge Catoa on the wapiti, ‘Transact. Ottawa Acid. ■!&*• 
* 4 ° : B]yUl ’ ‘ L “ d ^ 
‘ 5 ‘Himter’s Essays and Observations,’ edited by Owen, 1861, vol- 11 
p. Zob. J 
