Buru babirusa teeth are strong enough to crack any kind of nuts. Babirusas lack the rostral bone in their nose, which is a tool used by other wild pigs for digging. Therefore, they prefer feeding on roots in soft muddy or sandy soils. Cannibalism was reported among babirusas, feeding on the young of their own species or other mammals. North Sulawesi babirusas form groups with up to a dozen of individuals, especially when raising their young. Older males might live individually. The north Sulawesi babirusa reach sexual maturity when they are 5–10 months old. Their estrous cycle is 28–42 days, and the
The Call of the Wild on trust and love. Writing in the "Introduction" to the Modern Library edition of "The Call of the Wild", E. L. Doctorow says the theme is based on Darwin's concept of survival of the fittest. London places Buck in conflict with humans, in conflict with the other dogs, and in conflict with his environment—all of which he must challenge, survive, and conquer. Buck, a domesticated dog, must call on his atavistic hereditary traits to survive; he must learn to be wild to become wild, according to Tina Gianquitto. He learns that in a world where the "club and the fang"