264 
sexual selection: mammals. 
Part 
II. 
dangerous to man as one at the age of six or seven 
years. 35 
4n the full-grown male Babirusa pig of Celebes 
(fig. 64), the lower tusks are formidable weapons, b^e 
those of the European boar in the prime of life, whd st 
the upper tusks are so long and have their points s<5 
much curled inwards, sometimes even touching th e 
Fig. U. Skull ul the Uttbirusa Pig (f><™ Wallace's ‘ Malay Archipelago ) 
forehead, that they are utterly useless as weapons 
attack. They more nearly resemble horns than teeth* 
and are so manifestly useless as teeth that the ani® al 
was formerly supposed to rest his head by hooking the 10 
on to a branch. Their convex surfaces would, however* 
35 Brehm, ‘ Thierleben,’ B. ii. s. 720-732. 
