It is a remarkable fact that the boars of all domesticated breeds have much
shorter tusks than wild boars. Many facts show that with many animals the
state of the hair is much affected by exposure to, or protection from,
climate; and as we see that the state of the hair and teeth are correlated
in Turkish dogs (other analogous facts will be hereafter given), may we not
venture to surmise that the reduction of the tusks in the domestic boar is
related to his coat of bristles being diminished from living under shelter?
On the other hand, as we shall immediately see, the tusks and bristles
reappear with feral boars, which are no longer protected from the weather.
It is not surprising that the tusks should be more affected than the other
teeth; as parts developed to serve as secondary sexual characters are
always liable to much variation.

It is a well-known fact that the young of wild European and Indian pigs
(3/26. D. Johnson 'Sketches of Indian Field Sports' page 272. Mr. Crawfurd
informs me that the same fact holds good with the wild pigs of the Malay
peninsula.), for the first six months, are longitudinally banded with
light-coloured stripes. This character generally disappears under
domestication. The Turkish domestic pigs, however, have striped young, as
have those of Westphalia, "whatever may be their hue" (3/27. For Turkish
pigs see Desmarest 'Mammalogie' 1820 page 391. For those of Westphalia see
Richardson 'Pigs, their Origin, etc.' 1847 page 41.); whether these latter
pigs belong to the same curly-haired race as the Turkish swine, I do not
know. The pigs which have run wild in Jamaica and the semi-feral pigs of
New Granada, both those which are black and those which are black with a
white band across the stomach, often extending over the back, have resumed
this aboriginal character and produce longitudinally-striped young. This is
likewise the case, at least occasionally, with the neglected pigs in the
Zambesi settlement on the coast of Africa. (3/28. With respect to the
several foregoing and following statements on feral pigs see Roulin in