American kestrels are colorful birds known for the dark “sideburns and mustache” markings beneath their eyes. About the size of a blue jay, they can be seen perched on telephone wires and trees near open spaces. These fierce hunters see ultraviolet light, allowing them to spot urine trails of voles or other prey.
Photo: "American kestrel (Falco sparverius)" courtesy of Keenan Adams/USFWS.http://bit.ly/2jgNYVj
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