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Spanish Imperial Eagles Aquila adalberti. On the left, a juvenile individual showing a light-colored plumage mainly based on the presence of pheomelanin. On the right, an individual showing the much darker full adult plumage (with white “shoulders”), based on eumelanin. This eagle species presents delayed plumage maturation, and the adult plumage is typically attained when individuals are 4 years old. Photographs by Stewart Finlayson, Gibraltar Museum.
