The following report summarizes the bird and marine mammal ob- servations conducted aboard the R/V THOMAS WASHINGTON during EASTROPAC cruise No. 75 from 15 February to 15 April, 1968. During this period 367.4 hours of diurnal observation were conducted over a distance of 3660 nautical miles with 2984 birds observed. Cooperation from the crew and scientific party personnel was ex- cellent and much appreciated, especially when launching and retrieving the skiff. Special thanks go to Captain Noel Ferris and Dr. Warren Wooster who were most generous with their time and assistance. ITINERARY 15 February, 1968 1400 Depart San Diego 18 March 0600 Arrive Isla San Cristobal 18 March 0900 Depart Isla San Cristobal 18 March 1300 Arrive Isla Baltra 18 March 1900 Depart Isla Baltra 27 March 2300 Arrive Isla Baltra 28 March 0600 Depart Isla Baltra 9 April 0900 Arrive Acapulco, Mexico 9 April 1900 Depart Acapulco, Mexico 15 April 1530 Arrive San Diego The cruise departed San Diego and proceeded directly to 20°N119°W; then due south to 20°S, east to 112°W, and north to 7°48'S. At that point we departed the cruise plan, because of an ill crewman, and pro- ceeded directly to the Galapagos Islands for an air evacuation. We returned to 10°S 98°W, on the leg originally planned for the R/V JORDAN, and continued north. Just before reaching the equator one of the scientific party swallowed a piece of glass which cut his esophagus, and we again departed for the Galapagos Islands for an air evacuation. Again the ship returned westward to 98°W and the equator, where scheduled current measure- ments were conducted for one week. Upon completing this work, the ship turned north along 98°W and then sailed to Acapulco for refueling before returning home along the Mexican coast. Diurnal observations were conducted from the bridge during nearly all of the underway time. The WASHINGTON'S skiff was used for collecting, primarily during the current meter studies at the equator, but also at other places on the trip. Observations were conducted during a portion of the return trip along the Mexican coast, but these data have little meaning outside of species present and general abundance. The following division of the data into areas is based upon numbers and types of birds present, and, to a lesser extent, oceanographic factors. AREA A California Current 16 February 1968 Characterized by the presence of albatross, gulls, and alcids.