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Chaley

Birds of prey can see piss trails from the air;
They can even see ultraviolet light, which is invisible to the human eye. This means they can detect the urine trails left by rodents on the ground, helping the birds locate their prey
Woodlandtrust.org.uk

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owl in reply to @Chaley

Kestrels do this whilst hovering impressively

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ELbowloh in reply to @owl

And their head is like its on a gimbal, it stays completely still relative to their prey even when their wings and tail are moving.

If you ever see one on a falconers glove when they're focused on something and the falconer moves his arm around, the head stays in the same spot.

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