Nah. I don't buy it. Don't know why; can't say why. But I don't buy the "since most hibernating species mate immediately after hibernation and usually in close proximity to it, using the same den as your close relatives increases the possibility of inbreeding, which over time reduces the genetic diversity and increases the risk of the whole population being knocked out."

There's got to be some other factor. Else you can toss out the entire survivial of the fittest theory.