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Like other members of its genus, the males of this rhinoceros beetle (Xylotrupes ulysses clinias) exhibit variation in horn size with some individuals having very long horns (as shown here) and others with very short horns. This extreme dimorphism is controlled by an environmentally influenced genetic switch. South Sulawesi, Indonesia.

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© Chien C. Lee
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Contained in galleries
Sulawesi & Moluccas, Insects
Like other members of its genus, the males of this rhinoceros beetle (Xylotrupes ulysses clinias) exhibit variation in horn size with some individuals having very long horns (as shown here) and others with very short horns. This extreme dimorphism is controlled by an environmentally influenced genetic switch. South Sulawesi, Indonesia.