This is the second and very similar Prion species that we saw on our voyage across the Drake Passage to Antarctica. As you can gather from the name, the best field mark to tell these apart from the Antarctic Prion is the shape and length of the bill which is more slender on this one. There are other subtle field marks that add up to give this one a different overall impression. For example, the M shape on the back is less pronounced and the white supercilia (eyebrow) is wider and consequently gives it less of a black mask.
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