627K views · 20K reactions | Wolfpacks have a strong hierarchy and rich social life, with leading ladies, wily elders and rival cousins. Yellowstone National Park is one of the best places to study the behaviour of wild wolves as researchers like Kira Cassidy can get close enough to identify individual wolves by their markings and personalities. Tune in to Unexplored Americas on Tuesdays at 8pm on National Geographic WILD UK. | National Geographic UK | Facebook