AP Blue Sky Science: Why do some animals go extinct while other species regenerate? May 15, 2019 Facebook Twitter SMS Email Print Save Some species are simply more rare than others and don’t occur in very large numbers. But usually there is some factor that has driven a population to even greater rarity. Tags Wire Field59 Blue-sky-science Latest video Sioux Center’s Zeke Foltz Sioux Center’s Isa Granillo Watch Aaron Rodgers lose a beer chugging contest to Bakhtiari and Yelich Large wedge tornado swirls ominously at night in Oklahoma Virginia storm causes transformer to explode Daylight reveals tornado damage to Jefferson City, Missouri Memorial Day: What will the weather be for your area? Sparks fly from Virginia power lines in midst of wild storm Facebook Twitter SMS Email Print Save Load comments Most Popular Two taken to hospital after Browns Lake boating accident Monona County man mistakes wife for intruder; shoots her Coraline Harding Saturday in the Park: Lineup for July 6 festival in Sioux City taking longer than normal 'Black Friday every week': New 'It's $5' store in lower floor of former Younkers space View All Promotions promotion Progress: Retail promotion spotlight What kind of craft beer are you?