The insect that harvests solar energy to power its own body
In short: Most insects rely on external heat to stay active, but the Oriental hornet might be different. It possesses a yellow stripe on its exoskeleton that can absorb sunlight to generate an electrical potential. This biological solar panel may provide the energy required for the grueling task of digging underground nests.
The Oriental hornet (Vespa orientalis) is a unique social insect capable of thriving in arid climates like the Middle East and North Africa. Unlike many wasps that are most active in the early morning, this species peaks in activity during the middle of the day. Research suggests this is linked to their ability to harvest solar energy. Their cuticle contains yellow pigments—specifically xanthopterin in barrel-shaped granules—that absorb up to 99 percent of visible light. This absorption creates a negative electric potential at the hypocuticle relative to the exocuticle, a difference that increases when exposed to light.
Scientists hypothesize that this electrical potential may power a specific thermoregulatory organ located in the thorax. This butterfly-shaped organ, only 1 millimeter in diameter, can maintain a temperature about 9 °C (16 °F) above the ambient environment. This specialized internal heating, potentially fueled by the hornet's 'solar' stripe, allows them to remain active and perform heavy labor, such as digging underground nests, even when environmental conditions fluctuate. The brown segments of their body also contain melanin to protect against UV radiation, while the surface structure acts as a diffraction grating to trap light.
Beyond their unique physics, these hornets are master scavengers and primary pests to honey bees. They are haplodiploid, meaning they share a high degree of genetic relatedness (75% between sisters), which drives their altruistic social structure. They communicate through complex sound vibrations to signal larval hunger or to prompt the queen to lay eggs. Furthermore, they exhibit a fascinating symbiotic relationship with brewer's yeast, which may help them 'preserve' fruits by fermenting them, and they possess multiple copies of the alcohol dehydrogenase gene, allowing them to tolerate ethanol levels as high as 80%.
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Sources
- Summary by Intellect · source: Oriental hornet
- Also: iNaturalist — Oriental Hornet (Vespa orientalis) · CC BY-SA 4.0 (Wikipedia summary)
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