A flight of sea-swallows rested on the Nautilus. It was a species of the Sterna nilotica, peculiar to Egypt; its beak is black, head grey and pointed, the eye surrounded by white spots, the back, wings, and tail of a greyish colour, the belly and throat white, and claws red.
Jules Verne. Twenty Thousand Leagues under the Sea.
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Why did they make birds so delicate and fine as those sea swallows when the ocean can be so cruel?
Ernest Hemingway. The Old Man and the Sea, p.29 (1952)
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I would feel the satisfaction of being shut in from the outer world (like the sea-swallow which builds at the end of a dark tunnel and is kept warm by the surrounding earth)