Up in a Yukon, all lake and river will freeze during the winter. Due to some infiltration of temperate water from underground, there is some channel who won’t freeze. The Chum Salmons know it, and will come to use thoses channels to spawn during their late and exhausting journey. Grizzly bears will than come there to feed on them up to December by temperature dropping below -20 C. They are known as Ice Bear, as their wet clump of fur will freeze and create icycles.