4/23/16, by Sam Cook, Duluth News Tribune

Researchers visit wolf dens to learn more about pup survival and wolf population dynamics

…She knew what she would find once she slithered head-first down the entry hole and into the den. A pile of wolf pups. Maybe two weeks old. Five of them…The research is part of a state and tribal effort to better understand the dynamics of Minnesota’s wolf population. “It’s a component of our broader wolf monitoring,”…The work eventually will help wolf researchers monitor pup survival and learn more about what factors influence that survival.

http://www.duluthnewstribune.com/outdoors/4016661-researchers-visit-wolf-dens-learn-more-about-pup-survival-and-wolf-population