Falco sparverius - Lauren HeltonFor Month of Love 2019: TruthThe skin color around the eyes and bill
Falco sparverius - Lauren HeltonFor Month of Love 2019: TruthThe skin color around the eyes and bill of American Kestrels is brighter in birds that are more successful hunters, since this coloration comes from molecules called carotenoids that are found in their prey. The richer the orange coloration, the more likely the kestrel is a skilled hunter that can provide food for nestlings. In biology, carotenoid-based skin and feather coloration is an example of an honest signal, for no amount of deceptive behavior can change their skin color. -- source link
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