adam yamaguchi has this story from north of the border. >> what have you got there?on the canadian prairie, the search begins for one of north america's most destructive animals. >> these tracks are clearly quite fresh, right? and you see them going in both directions. >> reporter: professor ryan brook of the university of saskatchewan has been tracking them for years. >> they're here for sure, and lots of them, not just two or three. it's kind of mildly alarming. >> reporter: brook is one of canada's leading authorities on the so-called super picks. he calls them an ecological train wreck. they're crossbreeds, wild boars deliberately bred with domestic pigs. big, smart, and prolific breeders. the population now spreading out of control. why is it so difficult to eradicate this problem? >> i think there is two challenges in canada. one is their biology makes them very, very hard to get rid of. they reproduce faster than you can shoot them. >> reporter: they will eat anything to survive, with devastating consequences. >> they've eaten everything that's of value off of