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Plate 33. A (Upper). Grouse nest destroyed by a horned owl killing setting 

 hen, after which a fox ate the eggs. Note feathers and broken egg shells. B (Lower 

 left). The common skunk loves eggs, and occasionally stumbles onto a grouse 

 nest. In some areas it may be one of the most destructive of grouse predators. 

 C (Lower right). Great horned owl, one of the most efficient of all predators, a 

 prime enemy of the grouse. Photo by Pennsylvania Game Commission. 



