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Sula nebouxii excisa
Taken at Tortuga Bay (Black Turtle Cove) at Santa Cruz Island. The first photo shows the difference in foot coloration between the sexes. The male has the brighter blue feet on the left, females have a duller blue coloration. Mate choices are based largely on the brightness of the males feet.
Found on rocky coasts of most islands
Subspecies is endemic to the Galápagos