ML616529714
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Although I have never knowingly seen a Broad-billed Prion, or a MacGillivray's Prion, I have seen many thousands of Antarctic Prions. Antarctic is certainly the only expected "heavy-billed" prion in waters between the Falklands and South Georgia -- but this bird strikes me as outside the range of variation of Antarctic, past the "large-billed" extreme, and the bill shape also looks a little more steeply "triangular", deeper at the base and not quite as "tapered" toward the tip as is typical of Antarctic. Additionally, there is no gular bulge (bill not full of food) affecting the apparent depth of the bill. Unfortunately, I managed only this one photo. I see that there is a 4 January 2024 record with a photo of Broad-billed Prion near the Falklands. I suppose the record-breaking global warmth of 2023 might have induced some largely unprecedented displacement of seabirds...
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