Trypoxylus dichotomus, the Japanese rhinoceros beetle, is one of the most iconic and beginner‑friendly dynastines in culture. It’s widespread across East Asia and famous for its fast development, impressive males with Y‑shaped horns, and its deep cultural significance in Japan. Adults emerge in early summer, feed heavily on sap or fruit, breed rapidly, and die off by autumn, with the species overwintering as larvae.
 
Adults are medium‑sized rhinoceros beetles, typically 35–89 mm, depending on sex and subspecies. Males use their forked horns to wrestle rivals, while females are smaller and hornless. Colour varies from jet‑black to maroon‑red. In Japan, they are so popular that larvae are sold cheaply in supermarkets for children to rear, and wild adults are commonly found feeding on oak sap in summer.
 
Larvae develop quickly—egg to adult in 6–8 months—making them one of the fastest rhinoceros beetles to rear. Eggs incubate in about 2 weeks, larvae pupate for roughly 1 month, and newly emerged adults take another month to harden before becoming fully active. Adults typically live 2–6 months, depending on temperature and diet.