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The Western Capercaillie (Tetrao Urogallus), Also Known As The Eurasian Capercaillie. The Western Capercaillie Is The Largest Of All Grouse Species. Similar To The Black Grouse It's Known For The Mating Ritual. Males Perform For Females With With Puffed Out Feathers, Strutting And Very Distinct Calls. During Mating Season The Ritual Can Get Very Aggressive And Males Can End Up Killing Each Other