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Dynastes Tityus Video Stock Footage
Adults of both sexes are 20–27 millimeters (0.8–1.1 in) wide, and males are 40–60 millimeters (1.6–2.4 in) long, including a long horn (the pronotal horn) which projects forwards from the thorax of the male a second horn (the clypeal horn) projects upwards from the head. Dynastes tityus is therefore "among the longest and heaviest beetles in the United States". The horns are used in battles between rival males competing for a mate the size of the horn reflects the availability of food when the beetle was growing. Despite the size of the horns, Dynastes tityus is harmless to humans. The elytra are green, gray, or tan, usually with black mottling. The pattern of spots is unique to each individual. Beetles that are found in the soil or in rotten wood often appear very dark, with the spots on the elytra obscured. This results from moisture which the shell has absorbed when the elytra dry out, they return to their paler color. Occasionally, both elytra may be a uniform mahogany color, or one elytron may be pale with dark blotches, while the other is a plain mahogany color. Dynastes tityus was featured on a stamp issued by the United States Postal Service in October 1999.
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