CHAPTER X.
SEA-BIRDS.
Their Vast Numbers.--Strand-Birds.--Artifices of the Sea-Lark to protect its Young.--Migrations of the Strand-Birds.--The Sea-Birds in General.--The Anatidæ.--The Eider Duck.--The Sheldrake.--The Loggerheaded Duck.--Auks and Penguins.--The Cormorant.--Its Use by the Chinese for Fish-catching.--The Frigate Bird.--The Soland Goose.--The Gulls.--The Petrels.--The Albatross.--Bird-catching on St. Kilda.--The Guano of the Chincha Islands 142