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| The Nazca booby was formerly considered a subspecies of Masked booby, but now is recognized as a separate species. They have an orangish bill whereas the Masked booby has a yellow bill. Both have olive to grey legs and feet. |
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| The Nazca booby was formerly considered a subspecies of Masked booby, but now is recognized as a separate species. They have an orangish bill whereas the Masked booby has a yellow bill. Both have olive to grey legs and feet. |