294 
SEXUAL SELECTION : MAMMALS. 
Pakt 
It 
the adult male and with the young of both sexes, as I 
saw in the Gardens, neither the naked skin at the 
posterior end of the body, nor the face, shew a trace 
of red. It appears, however, from some published 
accounts, that the male does occasionally, or during 
certain seasons, exhibit some traces of the red. Although 
he is thus less ornamented than the female, yet in the 
larger size of his body, larger canine teeth, more de- 
veloped whiskers, more prominent superciliary ridg eS > 
he follows the common rule of the male excelling the 
female. 
I have now given all the cases known to me of a dif- 
ference in colour between the sexes of mammals. Tk e 
colours of the female either do not differ in a sufficient 
degree from those ot the male, or are not of a suitable 
nature, to afford her protection, and therefore cannot h« 
explained on this principle. In some, perhaps in many 
cases, the differences may he the result of variation 13 
confined to one sex and transmitted to the same » eS > 
without any good having been thus gained, and there- 
fore without the aid of selection. We have instances 
ol this kind with our domesticated animals, as in tb® 
ma es ol certain cats being rusty-red, whilst the fernal eS 
are tortoise-shell coloured. Analogous cases occur 
under nature ; Mr. Bartlett has seen many black var- 
ieties ot the jaguar, leopard, vulpine phalanger aD( 
wombat ; and he is certain that all, or nearly all, "' el ’ e 
males. On the other hand, both sexes of wolv e3 ’ 
foxes, and apparently of American squirrels, are occa- 
sionally born black. Hence it is quite possible that 
with some mammals the blackness of the males, especi- 
ally w hen this colour is congenital, may simply be th® 
result, without the aid of selection, of one or nior® 
variations having occurred, which from the first "’ere 
