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Thread: Phenomenal Numbers of Cook's Petrels off California

  1. #1
    Senior Member AndyB's Avatar
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    Feb 2005

    Default Phenomenal Numbers of Cook's Petrels off California

    Photos have been posted on N. American Stop Press gallery this week from southern California but the impressive numbers continue with over 130 birds seen today off Monterey

  2. #2
    Join Date
    May 2005


    Hi Andy (et al),
    Per chance do you know what criteria they are using to rule out Pycroft's Petrel please?

    This brief article has a few pointers

    All the best

  3. #3
    Senior Member AndyB's Avatar
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    Feb 2005


    Hi Marcus, that's an excellent link. I've bookmarked it, thanks. This paper in Western Birds also covers those two species plus Stejneger's and De Filippi's. It all highlights that the ID shouldn't be taken lightly. Cook's is the expected gray summer pterodroma but we shouldn't make any assumptions.

    My field experience is zero, but looking at a few of the photos of the flocks (such as this series here), head pattern, collar, bill shape would seem to tend towards the features of Cook's.

    If the amount of white visible on sitting birds is also a reliable feature (Hadoram note in your link), the sitting flock in the photo above also fits better for Cook's too.

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