-9- Sooty Tern 1316 (Sterna fuscata) Concentrations of Sooty Terns were found in two general areas. Along the mouth of the Gulf of California on 22 February large numbers were seen feeding over tuna in mixed flocks of Townsend's and Manx Shearwaters. Other lesser concentrations were recorded over tuna or sailfish north of 10°N. Other concentrations occurred at about 15°S on 12 and 16 March where birds were noted feeding over tuna or schools of flying fish. In the latter in- stance the flying fish were believed to be surfacing in huge numbers because of submerged tuna activity. The two widely scattered concentrations (north and south) probably indicate birds from two different origins. Fairy Tern 14 (Gygis alba) Most birds were recorded as single sightings or pairs and often in accompaniment with Sooty Terns in feeding flocks. All sightings were in the southern hemisphere from about 5°S southward.