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The latter are of nocturnal habit when seeking food, and during the daytime lie almost motionless near the bottom, where they can often be seen in serried masses. As soon as night falls they rise to the surface and give chase to flying-fish and other surface-swimming ocean fish. In shape they are very similar to a salmon, but do not possess the same deepness of body and general fulness.
Some of the most fascinating cases, on account of the beauty of the little creatures concerned, are found amongst the surface-swimming Ascidians of the sea the glass-like Salps.
One may naturally wonder what these petrels can procure for food in the ocean to the southward of 35 degrees south latitude, where they are perhaps more numerous than elsewhere, and where the voyager never sees any surface-swimming fishes which they might pick up?
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