For some, like the grizzly bears of Banff National Park in Alberta, Canada, it took upwards of five years for the bears to consistently use the wildlife crossings, even though many other species such as elk, moose, coyotes and wolverines, were already using the wildlife crossings regularly. With such lag, people (understandably) start to wonder whether the cost of such wildlife crossings, usually to the tune of about $4 million, is really worth it. But researchers continued to study strands of bear hair DNA
on barbed wire to observe bear activity and whether or not bear were mating with bears on the other side of the highway. Ultimately, the wildlife crossings were encouraging the grizzlies to expand their breeding ground—which had been disrupted by road development—and the animals were indeed mating successfully. One studly black male sired 11 offspring with five different females, just by crossing back and forth over the wildlife crossing!