Wolves are also thriving in the northwoods of Minnesota. Their population is estimated to be over 2-thousand and they soon may be pulled from the endangered species list. But Minnesota doesn't have the largest population of wolves in the United States. Doctor David Mech is a renowned biologist who has studied wolves in Minnesota since 1966. He's in town today to speak about the wolves of Denali National Park in Alaska, the subject of his new book: "The Wolves of Denali".