Appearance
The "major" males of this species have three large horns on their thoraces, resembling Triceratops. The "minor" males have horns, as well, but the two back ones are small and the frontal horn is much shorter than the horn in major males. The female ox beetle has a very short horn which has little use in fighting, but is used for digging in the ground. These beetles grow to about 1.0 to 1.5 in (2.5 to 3.8 cm) long as adults when the horns are excluded in the males.References:
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