Salvin's Prion (MacGillivray's)

Pachyptila salvini macgillivrayi

ML51245011


©
Johnny Wilson
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eBird Checklist S35197207
Gough Island (historical only, not for current checklists. Please use more specific locations.)
Tristan da Cunha, Saint Helena, Ascension, and Tristan da Cunha
Search this location, Illustrated Checklist
Latitude and Longitude -40.3178, -9.9323 Map

Age
Unknown
Sex
Unknown
Behaviors
Breeding
Tags

Media notes

Observation details

At the time I visited Gough Island I called all the prions on land broad-billed prions, as was the custom for birders before me as well. Subsequently, Peter Ryan and coworkers found that there were two ‘bill morphs’ of the broad-billed prions on Gough (see https://link.springer.com/article/10.1007/s00300-014-1473-2, see also http://www.hbw.com/news/new-prion-gough-island). In this paper they commented on how similar the ‘blue-billed’ morphs were to Salvins/MacGillivray's, but didn’t go a far as to call them that. In subsequent publications, these were called as such (e.g. https://doi.org/10.1017/S0954102015000279). The photos pictured here were taken at ‘prion cave’, where these Salvins/MacGillivray's prions were ‘discovered’. While I did not measure the bills of these birds, it is evidently blue, as noted in the description. For anyone who knows prions, this is a hard group of birds. The fact that there are no MacGillivray prions reported from the area in the past is not a reflection of their rarity - there is an estimated 500,000 pairs on Gough. It would thus behoove future birders to the area to give these birds another look. I’ve also added photos of a dark-billed broad-billed prion to another list for comparison (http://ebird.org/ebird/view/checklist/S35261901).

Technical Information

Model
NIKON D70s
f-stop
f/4.5
Focal length
44 mm
Shutter speed
1/60 sec
Flash
Flash fired, return detected, auto
Original file size
2,433KB
Dimensions
3008 x 2000

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