Marine Mammals EAC 32 - December 2 
Few mammals were recorded in the Grid. The low numbers recorded are 
thought to be due in part to the heavy sea and poor observing conditions. 
1043 ” A single Zalophus californianus was observed porpoising along with 
the ship. 
1254 - Between 4 and 6 Lagenorhynchus obliquidens of two subgroups were 
observed in a stationary position near the surface (feeding?). When 
the ship approached they crossed the port bow swimming to the east. 
All the dolphins were swimming at a much slower rate than that 
usually observed for this species. After surfacing they dropped to 
only a few feet below the surface before returning again to the sur¬ 
face . 
1320 - One Zalophus was noted floating at the surface. When the ship approached 
the sea lion swam off to the east. 
1358 - Globicephala scammoni (4otlO) in 3 °r 4 subgroups were noted to be in 
a semi stationary position on the surface. This schooling was similar 
to that called loafing group (Norris, 1958), except that dives of ca . 
30-45 seconds were undertaken. They may have been feeding. Ages of 
the Pilot Whales were mixed. Large adult males, many medium-sized 
whales (300-400 cm), and calves or yearlings were noted. 
1402 - Another Zalophus was noted porpoising. 
1440 - A single Zalophus was floating near a small patch of Neocystis . 
1610 - About 75tl5 Globicepha la in 4 or 5 subgroups, all seeming to be of 
medium size, were noted moving in a broad line south. This type of 
schooling is called traveling or hunting (Norris and Prescott, 1961)• 
No birds were noted with any of the above marine mammals today. 
December 3 (Non-Grid) 
O73O - About 20 - 5 Dali Porpoises were seen but did not come to ship. I-D. 
was based on speed and surfacing pattern (pushing much water ahead,etc.). 
0735 - About 15» 5 Dali Porpoise pushing a path of 6 to 8 feet of white water 
upon surfacing. 
0750 - One Eumetopias jubata adult male (large) positioned with head out of 
water (nose-up) - Phocid - like behavior. 
December 3 (Grid) 
1233 Sector T - One Sperm Whale ca_. 40 feet. 
1456 Sector T - Fifteen Dali Porpoises approached within 200 meters of ship. 
Same fast water-pushing behavior upon surfacing. 
December 5 
0946 - One Killer Whale 14 to 18 ft. Dorsal ca. 2-1/2 ft. high. Saddle aft 
