Volume 45, No. 2
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Key words: Antarctica, demographics, longevity, emigration, Southern Giant Petrel, Macronectes giganteus
Original abstract in English: The breeding of the Ancient Auk [now known as Murrelet], Synthliboramphus antiquus, has not hitherto been known from Hokkaido. In the springs of 1955 and 56, the author found carcasses of this bird on the [i]sland of Teuri, off the western coast of Hokkaido. Then at last a colony of Ancient Auk[s] with approximately 500 individuals has been found nesting on the steep cliff, which consisted of pebbles and scanty humus. Above their nesting site, there were about 500 Cerorhinca monocerata [Rhinoceros Auklet] and below there were about 1 000 Larus crassirostris [Black-tailed Gull]. The ancient auk makes a simple dish-like nest with a diameter of about 10 cm using gramineous grass, 30-50 cm deep in the natural crack. Two eggs are laid in June. The male and female incubate the eggs alternately. On the 1st of July, 1956, the chicks were being fed by the parent birds. The chicks leave the nest by the middle of July.
清棲幸安,1952 日本鳥類大図鑑 KIYOSU, YUKIYASU. 1952. Japan Birds Large Picture Book.
村田英二,1956,手売り島の会長類の保護について, 昭和31年度日本鳥学会総会講 MURATA, EIJI. 1956. Conservation of Teuri Seabirds [presentation], Japan Ornithological Society General Meeting.
UDAGAWA, T. 1955. Avifauna of Teuri and Yagishiri Island, Hokkaido. Tori, Vol. XIII No. 63.