3 Newell's Shearwater A sharp 150% increase from 12 in April to 66 in May was experienced this month due probably to the beginning of its breeding cycle in the main Hawaiian Islands. This species was seen in all parts of the grid except the eastern portion. Concentrations were found around Oahu and across the southern portion of the grid. This species was observed frequently in small numbers in feeding flocks composed mainly of Sooty Terns and Wedgetailed Shearwaters. Bonin Island Petrel Numbers of this species rose abruptly from 2 in April to 69 in May, all but one of which were in the south to southeastern portions of the grid area. Virtually all of these birds were undergoing heavy molt. Several were flushed from the water by the approaching ship. Herald's Petrel? Two medium sized chunky petrels with brown upperparts, white under- parts and mottled dark underwings were probably this species. Both birds were clearly seen at close range. Dark-rumped Petrel This species rose 671% in numbers, from 17 in April to 131 in May. All but 6 of these were in the southern portion of the grid area. All of these southern birds were undergoing heavy molt. Primary and secondary wing feathers were often missing and the entire dark upperparts were spotted and mottled. Many birds were flushed from the water by the approaching ship. The northern birds had without exception fresh plumage.