Abstract
1. This paper reports the distribution and migration of Pterodroma inexpectata and Pterodroma solandri in the North Pacific based on the data collected by the authors during three cruises in 1974 and 1975.2. Field descriptions of the two species are given.3. P. inexpectata is a cool current species, appearing to be scattered widely in small groups along the Subarctic Front after finishing its migration, where the average surface water temperature was 10°C in summer. The highest densities were reached over waters of 8-10°C, off the Aleutian Islands and the Alaska Peninsula.4. Some individuals of P. inexpectata seen in May from 40°N to 45°N were more solitary when travelling, moving steadily northward with fast and directional flight, which suggested a migration through open seas into the most suitable temperature zone for them. Although some individuals had already arrived in the Subarctic zone in May, peak numbers were reached in July and August.5. P. solandri was also encountered several times near and within the Subarctic Front. About 490 birds were seen from 5 May to 16 May, 1974. The large number of sight records of birds identified as belonging to the species indicate the existence of a regular migration to the Northwest Pacific.
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