A male Banded Phintella (Phintella vittata) sporting his fancy UVB reflective patches. Wait, what?
UVB light is a band of UV light that is not just invisible to us, but is also the leading cause of skin cancer in humans; most other animals that are known to be capable of seeing it are also known to actively avoid it. Amazingly, P. vittata (the miniscule, stunning jumping spider pictured here) uses this UVB light to look sexy. The metallic blue patches on this male's body are designed to reflect UVB light, which grabs the females' attention. Experiments have confirmed this by observing that removal of the UVB light makes an otherwise girl-bait male not so special.
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