Bears hibernate during the winter months in most areas of the world. Duration of winter denning is dependent upon latitude and varies from a few days or weeks for black bears in Mexico to 6 months or more for bears in Alaska (Kolenosky and Strathearn 1987, Haroldson et al. 2002).
On March 17, 2016, History renewed Vikings for a fifth season of 20 episodes, which is set to premiere on November 29, 2017.
Vikings Season 5 Air Date /Release Date. After witnessing such a powerful portrayal of the life of Ragnar Lothbrok and the series of events that took place in his life through all the four phenomenal series, the urge for the production of Vikings Season 5 by the viewers were very much legit.