Dozens of bison walk through queue of cars in Yellowstone

A cool video has emerged of dozens of bison with their calves walking on a road in Yellowstone National Park, USA. According to the filmer, the migrating bison blocked traffic for hours.

http://www.msn.com/en-us/video/animals/dozens-of-bison-walk-through-queue-of-cars-in-yellowstone/vi-AAhr2On?ocid=spartandhp