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Tetrao urogallus, Print, The western capercaillie (Tetrao urogallus), also known as the wood grouse, heather cock, or just capercaillie, is the largest member of the grouse family. The largest known specimen, recorded in captivity, had a weight of 7.2 kg (16 lb). The species shows extreme sexual dimorphism, with the male twice the size of the female. Found across Eurasia, this ground-living forest bird is renowned for its mating display. The worldwide population is in the category "least concern" of the IUCN, but the populations of Central Europe are declining and endangered or already extinct., 1700-1880