> Did you check that it is indeed a Cook's and not a Defilippi's/Masatierra
>Petrel (Pterodroma cooki? defilippiana). I assume that bill measurements are
>enough to separate these two species, they are extremely similar in plumage.
>I think most lists now consider this a species different from Cook's, but
>they have been lumped in the past. The reason I ask is that this species
>does disperse northward during the non-breeding season, however its pelagic
>range is largely unknown so it could show up in the north Pacific.
>
>Alvaro Jaramillo

Defilippe's Petrel seems to be separable from Cook's by tail pattern. The
specimen matches Cook's in having dark-tipped central rectrices and a lot
of white in the outer rectrices (the more sand we brushed off it, the
better it looked; it'll be prepared after the vacation). The reference:
Cookilaria Petrels in the Eastern Pacific Ocean, Part II, by Don Roberson &
Stephen F. Bailey, Am. Birds 45: 1067-1081, 1991.

Is there any tweeter reader who can say anything more about the "Pterodroma
sp." that was found on the Oregon coast after the first storm?

Dennis Paulson, Director phone: (206) 756-3798
Slater Museum of Natural History fax: (206) 756-3352
University of Puget Sound e-mail: dpaulson at ups.edu
Tacoma, WA 98416