Adam Martinson, (R) a student at the University of Calgary, and his assistant Murdoch Taylor catch a prairie rattlesnake on a road in Dinosaur Provincial Park, Alberta August 7, 2008. in this picture taken August 7, 2008. Martinson has come to Dinosaur Provincial Park, listed as a United Nations World Heritage site, to study why snakes slither onto -- and too frequently die on -- the asphalt blacktop of the region's roads. For prairie rattlesnakes, considered to be potentially a "species at risk" by the Alberta government, and bull snakes, their nonvenomous cousins, roads are a deadly hazard. Picture taken August 7. REUTERS/Todd Korol (CANADA)