Kestrels see in ultraviolet UV light how does this help them hunt?

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I believe that the field mouse or vole, or whatever the kestrel hunts marks concentric rings around its territory with urine. The mouse/voles urine comes up quite bright on the UV spectrum, so the kestrel often hovers where it can see these bright rings and keeps an eye out for the mouses/voles activity within the ring.
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