Boar
Sus scrofa

Central European Wild Boar
Sus scrofa scrofa
Domestic Pig
Sus scrofa
Gloucestershire Old Spots
Sus scrofa
Guinea Hog
Sus scrofa
Mulefoot Hog
Sus scrofa
Vietnamese Pot-bellied Pig
Sus scrofa domesticus
Wild Boar
Sus scrofa

Related Links
Honolulu Zoo - Vietnamese Pot-bellied Pig
Oklahoma State University
Flickr - may have photos
Wikipedia - may have a species page