sea swallow

There was a light breeze off the land; it was scarcely strong enough to lift the heavy fog which lay over the skerries and the naked cliffs, from which the scared sea-gulls flew and hovered around us with their hoarse cry; the sea-swallows uttered their ringing "Tree, tree," and the oyster-catchers their mocking "Click, click!" which has caused so many an unsuccessful sportsman to smile.