Manx Shearwater "Manx Type Shearwater (Total Observations - 5,193 The large flocks of Manx Shearwaters observed on 5 June within 15 miles of the Manzanilla/Acapulco coast account for nearly 60 percent of the total birds (all species) seen. Feeding flocks of 500-plus birds were encountered at 2-3 mile intervals during an afternoon of skiff work there. Birds were clumped densely on the water surface and appeared to be feeding actively. Most birds were in obvious molt with gaps showing in the flight feathers. Birds of the Manx/Audubon's type were regularly seen from the Gulf of California to the Gulf of Panama. While I believe that most of the Manx types seen were indeed Manx, several times I suspected that Audubons were present. No Audubons were positively identified, however. Christmas (Island) Shearwater Puffinus Nativitatis Total Observations - 20 I can find no previous record of this species for the eastern Pacific cost. Each of the large feeding flocks of Manx Shearwaters investigated off the coast on 5 June seemed to have 1-3 of these birds. One female with a granular ovary was collected. Without the use of the skiff I am confident this species would have been completely overlooked. Cooks Petrel Total Observations - 184 Cooks Petrel was the dominant species observed between Guadalupe Island and the tip of Baja, California. Several large flocks were found milling about on the water near what appeared to be the edge of rising water cells. Storm Petrels were also plentiful in these flocks. One female with granular ovary was taken the first of June. Most birds were in heavy wing molt with confusing white patches and streaks visible from above. Leachs Storm Petrel Oceanodroma leucorhoa North of about 12°N most of the "White-rumped" Storm Petrels are prob- ably this species. For three days in the vicinity of Guadalupe Island the dark-rumped population, O. l. socorroensis, was present at about one-fifth the density of the white-rumped form. One female socorroensis with enlarged gonads was collected approximately 40 miles south of Guadalupe Island on 1 June. After a 1,500-mile gap "Dark-rumped" Storm Petrels were again seen off Panama. It is possible that these were Least Storm Petrels. Galapagos Storm Petrel Oceanodroma tethys When three days out of Panama "White-rumped" Storm Petrel sightings increased again after a dropping off from the Leachs peak off Lower Baja. On 9 June "White-rumped" Storm Petrels were noted following the ship's wake and by 11 June up to 25 at a time were following astern. Most, if not all, of the "White-rumped" sightings below about 12°N are likely this species. I have seen no mention of ship-following tendencies in other sources.