BILLINGS, Mont. — A new tally of gray wolves in the Northern Rockies shows the population held steady across the region in 2009, ending more than a decade of expansion by the predators but also underscoring their resilience in the face of new hunting seasons in Montana and Idaho. Biologists said the region's total wolf population has remained stable and will be similar to 2008's minimum of 1,650 wolves in Montana, Idaho and Wyoming. The number of breeding packs increased slightly, from 95 to 111.