dung beetle vs scarab beetle

Any of the true dung beetles of subfamily Scarabaeinae. 

Any of the beetle of the family Scarabaeidae (scarab beetles), especially of the subfamilies Scarabaeinae and Aphodiinae, noted for rolling dung into balls for use as food or as brooding chambers. 

Any of very many beetles, of the family Scarabaeidae, especially Scarabaeus sacer regarded as sacred by the ancient Egyptians