Since egg dates for Hawaii are thought to be April-May and for the Galapagos race June-July, it may be the case that the northern, fresh plumaged birds are the Hawaiian race and the southern, heavily molting birds are from the Galapagos Islands. White-necked Petrel Numbers of this species increased from three in April to 34 in May. All of these were seen in the southern end of the grid area. All were undergoing heavy molt. Many had missing primary and secondary wing feathers, and birds were flushed from the water by the approaching ship. This species was often seen in close company with molting Dark-rumped Petrels, sometimes two or three of each species sitting together on the water. This species was found in the southern feeding flocks along with molting Dark-rumped Petrels, dark phase Wedgetails and Sooty Terns. Bulwer's Petrel This species increased in number 53%, from 28 in April to 178 in May. Large concentrations of this species were found around Maui and Oahu. Small flocks of up to nine individuals were seen, and a number of birds were seen in and around the edges of feeding flocks of Sooty Terns and Wedgetailed Shearwaters, but none was observed feeding. Harcourt's Storm Petrel Numbers of this species showed a 50% decrease from 129 in April to 64 in May. This species still showed the relatively random distribution throughout the entire grid area it has exhibited in past months. On one occasion four birds were seen sitting on and flying over a slick.