CHAPTER IV.

_DIVERS, GREBES, AND CORMORANTS._ Divers—Affinities and Characteristics—Great Northern Diver— Black-throated Diver—Red-throated Diver—Grebes— Characteristics—Changes of Plumage—Great Crested Grebe— Red-necked Grebe—Black-necked Grebe—Sclavonian Grebe— Little Grebe—Cormorants—Characteristics—Changes of Plumage—Cormorant—Shag—Gannet 151-184