Date: 11/21/20 5:21 pm
From: Robert O'Brien <baro...>
Subject: [obol] Re: Petrel vs. Shearwater
Whoops, forgot to sign. Bob OBrien Carver OR

On Sat, Nov 21, 2020 at 5:19 PM Robert O'Brien <baro...> wrote:

> After some study I'll have to agree with Jeff's immediate identification
> as Great-winged Petrel.
> Additional photos would be very, very helpful, even if blurry' and of
> course, as Jeff mentions, flight style.
> The main distinction is a very different shape/jizz in the photos attached.
> Great-winged has a much stubbier bill as this bird shows and a different
> overall shape, even though about the same size.
> See attached comparison with Short-tailed and Sooty Shearwaters, the only
> real competitors.
> I've posted this photo previously a few years ago as a distinction between
> the two shearwaters. My main computer
> with the original image is currently dead, awaiting resurrection. This
> one has a bunch of lines indicating comparative sizes
> of the two. The sizes are quite different. Just ignore the lines in this
> situation which apply only to the shearwaers..
> Note the quite different bills in all 3. Sooty and Short-tailed narrow
> but different in length.
> Note the short stubby bill on the Petrel. The overall size/shape of the
> neck/head is bulky in the Petrel and slender in both shearwaters.
> Note the rather sharp wing-tips of the shearwaters and the blunter tips of
> the Petrol.
> Both of these marks are discussed in field guides, particularly in er
> Harrison's *Seabirds*.
> The stubby bill shows well in Ed McVicar's photos:
> I fully realize that the relative shapes of flying seabirds can vary with
> wind, current flight, etc. Nevertheless, IMHO I'm pretty confident of
> Jeff's original ID.

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