A resident falcon often seen hovering for long periods scanning the ground below for insects, reptiles, voles, shrews or mice. Common Kestrels can see near ultra violet light allowing it to detect the signature urine drops that mice leave behind to mark their trails. This makes it a very efficient hunter, but unlike the Lesser Kestrel it defends territories and does not nest colonially, though where food sources and nesting sites are abundant, (for example on the sea-side cliffs of the lower Alentejo near the Quinta), there are sometimes so many that they can appear to be nesting colonially.
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