There are four different species of Babirusa, of which the Babisura from North Sulawesi is the best known. The peculiar appearance of this pig is that when the male matures, have remarkable tusks or canine teeth that can grow right up through the skin in their snout and curve back toward their forehead. The structure of the male canines varies by species, with the North Sulawesi Babisura having the longest and most curved canines. If they don’t grind these teeth, the teeth will grow long and pierce into their foreheads and eyes.

Male babirusa tend to live solitarily while adult females can be found in groups with young. Deer-pigs have a lifespan of 10 years in the wild and 24 years in an environment with human care.
In Indonesia, the striking appearance of the babirusa has inspired demonic masks, and the animal itself is sometimes used as a gift to present to visitors. Prehistoric paintings of babirusa found in caves on the island of Sulawesi in Indonesia have been dated back at least 35,400 years
However, this species is currently classified as Endangered by the IUCN as its numbers are decreasing due to habitat loss and poaching.

According to Wikipedia.