The Collared Peccary (Pecari tajacu) is an inhabitant of the south western U.S. and Central and South America. Often confused for pigs (family Suidae), P. tajacu and the other 3-4 Pecari sp. are members of the related family Tayassuidae. Interestingly, this group illustrates that there's still a lot we don't know about wildlife diversity: only recently was the Giant Peccary (Pecari maximus) described and proposed as a fourth Pecari. For more on the Giant Peccary check out the Tetrapod Zoology posts here and here, and the technical paper on page 9 of this PDF.