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africa african alert alone animal animals antelope beest bhutan blue bovine brindled close closeup common connochaetes dawn daybreak denmark dry dusk environment eye eyeing flocks gnou gnu grass grassland graze grazer grazing hair herd hoof hooves horn horns koege looking male mammal mammals mephoto morning muskantelope nature nose one peering portrait prey profile ree safari savanna savannah sight single south staring stevns takin taurinus watching wildebeest wilderness wildlife yellow zoo