 Caribou from the Western Arctic and Ray Mountain herds occasionally winter on Kanuti, as well.The refuge's migratory fish, chinook, chum and coho salmon, as well as sheefish, are creatures of extremes.Its sheefish make the longest spawning journey of any of their species, while Kanuti's salmon have to swim more than up the Yukon River before entering the Koyukuk River system to spawn.