New Zealand Shearwater One bird possibly of this species was observed closely on 13 April. The presence of this species in the area is still suspected but has not been confirmed. Sooty Shearwater This species continued its spring migration this month, with 507 birds recorded compared with 382 in March. The first week of April, when the peak of the spring 1964 migration took place in this area, was not included in this month's period of observation. It may well have been the migration peak this spring as well as last. Several birds were seen taking part in feeding flocks, but most were flying swiftly and directionally to the northwest. Newell's Shearwater Most of the 26 birds seen in April were spread over the southeast and central portions of the area. No concentration was noted. Only 12 were seen in April 1964. Christmas Island Shearwater Four individuals were seen, two between Kauai and Oahu on 11 April. Pale-footed Shearwater Two birds were recorded in April, both heading north. This species was unrecorded last spring but its presence in the area was suspected. Mottled Petrel Ten individuals were observed in April, all heading north in a manner similar to Sooty Shearwater. This species presence in the central Pacific was not suspected last year.