... Size 1.20 x .95. These birds generally take turns in the task of incubation, one remaining at sea during the day and returning at night while his mate takes her turn roving the briny deep in search of food. The young are fed by regurgitation upon an oily fluid which has a very offensive odor. This odor is always noticeable about an island inhabited by Petrels and is always retained by the eggs or skins of these birds. They are very rarely seen flying in the vicinity of their ... — The Bird Book • Chester A. Reed
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