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Birds of Prey Use Ultraviolet Vision to See Prey Urine Trails

M.L. Bream in the Toronto Star describes birds of prey using UV sensitive sight to observe urine trails of prey – example kestrel hunting voles. Excerpt: Returning to my car after a visit to the Leslie Street Spit on a day so grey the sky seemed to have swallowed the lake, I looked up to see a small dark shape perched on a nearby power line. It was a bird about the size of a mourning dove or blue jay. I’d recently seen a few doves resting on this very wire, so perhaps that was a possibility. But a…
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