Western Gull (Larus occidentalis) Adults and immatures were observed along the east shore of Guadalupe Island and off the north coast of Baja California. Herring and California Gulls (Larus argentatus and L. Californicus) Immatures were seen along the Baja coast as far south as Cape San Lucas; adults were seen only to the north of Magdalena Bay. Bonaparte's Gulls (Larus philadelphia) Seen almost exclusively off Magdalena Bay on 1 December. During the early morning immatures were seen in a ratio of 2 to 3 adults (N=29), but during the late morning and afternoon no immatures were seen among the 56 for which age was observed. Black-legged Kittiwake (Rissa tridactyla) Seen in low numbers off Magdalena Bay. Sabine's Gull (Xema sabini) Seen most commonly on 1 December off Magdalena Bay, but also seen along the coast as far south as Acapulco. Sooty Tern (Sterna fuscata) In terms of numbers this was the second most abundant species ident- ified on the cruise. However, most of the birds in the tally were in flocks, and the number of sightings was small. Both adults and immatures were seen in a 400 mile wide band between Clipperton and the Galapagos Islands, but no immatures were recorded on other portions of the cruise. The Sooties off Manzanillo and at the mouth of the Gulf of California were in fresh plumage with long tail feathers suggesting that they were nonbreeding birds. Elsewhere no adults were seen well enough to determine the plumage condition. ADDITIONAL BIRD OBSERVATIONS A distant flock of ca. 5000 birds believed to have been storm petrels was seen off Magdalena Bay, Baja Peninsula. Because this sighting was unique and its reliability questionable, it has not been included in this report excepting in the overall tally of seabirds in the introduction, and in table 1. Landbirds Landbirds were seen frequently on some parts of the cruise. A summary may be found in table 4. MAMMAL SIGHTINGS Mammals were scarce during the cruise; a summary of sightings is