R.D. Kirkpatrick 1964 Puffinus pacificus Sand Island, Johnston Atoll, Pacific Ocean Nov. eight inches. It was quite visible but " interfered somewhat with the bird's (cont) flight, at least initially after release. The streamer was attached on the upper wing against the birds body. Bird bearing band # 565-12759 had a # 7 vinyl streamer attached just as the preceding bird had but it only streamed about 3 inches. This made it visible longer or further away than the new leg streamer that had been attached but not as far as the 1st birds streamers. Bird with band # 565-12169 had a 6 inch long # 7 streamer attached to its right wing near the body. This seems to be the right length for good visibility. The streamer was still visible even after the bird was too far away for positive identification. Bird with band # 615-00394 had a # 7 streamer attached to the right wing out just before the start of the primaries. This did not seem to interfere with the birds flight and made the 6 inch long streamer visible for a maximum distance.