In general, males have larger and bigger muscles, therefore those areas of the bones where muscles attach tend to be larger and rougher than the same areas on female bones. With this in mind, take a close look at each skull, especially, the browridge (the ridge above the eye socket ), mastoid process (part of a temporal bone that extends down behind the ear), and external occipital protuberance which covers the back lower part of the head (it may protrude like a hook in the male, called an inion hook). You may have observed the similar size of the occipital protuberance in these two skulls. Analyzing human skeletal remains often aren't cut and dry. Anthropologists need to examine numerous characteristics by making visual comparisons and taking measurements before forming their conclusions.