Sunflowers in UV and daylight

Sunflowers in UV and daylight

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Caption: Sunflowers (Helianthus sp.) in ultraviolet (UV) light (right) and daylight (left). At right areas either reflect (light) or absorb (dark) the UV light. The light and dark UV patterns are known as 'nectar guides' and help to attract pollinating insects, which can see UV light. Humans are unable to see these patterns.

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