the greater sage-grouse, also known as the sagehen, is north america’s largest grouse species. previously known simply as the sagegrouse, the original grouping has been divided into the greater sage-grouse and the gunnison’s sage-grouse. brushy sage steppe habitats are crucial to conservation of this species; during the majority of the year, their diet is over 60% composed of sage, and the species cannot live in habitats where sage isn’t found growing densely. this unusual bird is also known for complicated lek-based breeding rituals where the male inflates the yellow sacs on his chest to ‘boom’ and strut, sometimes for hours.