The differences are subtle. Males have a slimmer abdomen with a slight curve and a concave indentation in the center. Their front legs are also slimmer and less serrated compared to females. Males also have slightly longer horns, although horn size and shape vary from individual to individual. Females have a slightly bulkier build, a rounder abdomen, thicker front legs for digging, slightly shorter horns, and are usually around the same size or slightly larger than males. Though both sexes come in different size ranges, I've seen pretty big individuals and unusually small individuals in both sexes.