-14- White-capped Noddy (Anous minutus) The single sighting of this species on February 16 is probably from Clipperton Island. Sooty Tern (Sterna fuscata) The most abundant species of the trip and the dominant species of areas "C", "E", and "F". The distribution was not as uniform as Leach Storm Petrel, but Sooty Terns were present in large numbers in select areas. Several populations representing different island origins were encountered. South of the equator Sooty Terns were probably from the Marquesas Islands. The immature found in this area was in fresh plumage indicating a fall nesting population characteristic of the Marquesas. Flocks feeding adjacent to Clipperton Island contained dark immatures. These birds are most likely of Clipperton origin and indicate a prolonged nesting season in Clipperton. Immature Sooty Terns recorded around the Revilla-Gigedos and to the east were molting from immatures to sub-adult plumage. These individuals appear light brown and are probably about 10 months old. An interesting ethological note is the lack of nocturnal sightings along the shipping lanes. White Tern (Gygis alba) Fairy Terns were observed casually in the Southern hemisphere. Individual sightings were of birds feeding alone, or in association with Sooty Tern flocks. Those birds are probably from the Marquesas Islands. Xantus Murrelet (Endomychura hypoleuca Observed adjacent to Baja California and identified as to race by their white underwing.