Galapagos field notes, v579
Page 87
Image from the Biodiversity Heritage Library. Contributed by Museum of Vertebrate Zoology, University of California, Berkeley. | www.biodiversitylibrary.org
Transcription
14 Jan on board "Golden Bear" of Baja Calif., Suv, Mex. They seem to dip down much in the manner of a swallow gathering mud or drinking. If they are feeding they seem to be taking something kicked up by the propellers. From the bow saw a group of 7 white rumped reach Petrels and 2 petrels which sat on the water with wings folded down, floating high on the water. Saw 3-4 jellyfish. By about 8 PM there were 20+ petrels, all reach following the boat. The afternoon symposium was short and got up about 3:30. There was a great cloud of 50+ petrels following the boat, but 1 reache's. A Black Petrel which offered good comparison. The wing beats are much deeper, and they tend to glide quite rapidly between separate wing strokes and longer between bouts of strokes. They stay much further back from the boat than the reach's, which came within 50-75 feet. The size difference is very conspicuous. From the bow saw 2 Booty Terns, which I first identified as a Trugubrid, circling high over the horizon & then flew off to the W as we approached. Didn't get a good look. Also saw 3-8 porpose, uniforue dark olivaceou [drawing of dolphin], slightly lighter below. moving N & paid no attention to the boat. When I went back to the rear of the boat about 4:30 only, about 10-20 Petrels following. They seem to have two sorts of wing beats, a deep, arch [drawing of wings] body lengths, and a high arc [drawing of wings], which were given more rapidly as the bird turned and dropped (after food). Couldn't