Game birds found include Canada goose, mallard duck, ruffed grouse, wild turkey, and bobwhite quail. Ruffed and spruce grouse are popular upland game birds. Fishers, martens, snowshoe hares, and ruffed grouse also browse American mountain-ash. Ruffed grouse have two distinct morphs&colon; grey and brown. Featured species included guanaco, Formosan sika deer, pied ruffed lemurs, and blue-eyed black lemurs. The male catkins are a food staple of ruffed grouse throughout the winter. They will attack birds up to the size of a ruffed grouse or ring-necked pheasant. The IBA is home to Swainson's thrush and ruffed grouse, the state bird of Pennsylvania. Broader study in the Pacific Northwest indicated that adult ruffed grouse were mainly taken. Some lemur species have extensive vocal repertoires, including the ring-tailed lemur and ruffed lemurs. Other nicknames for ruffed grouse include drummer or thunder-chicken. Suspensory behavior is more common in ruffed lemurs than in other lemur species. The captive population of red ruffed lemurs stands at 590 animals. Whines are highly variable between individual ruffed lemurs. The population of red ruffed lemurs is directed by a Species Survival Plan.