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allopatric allopatric species American bird animals Anser appears Archaeopteryx arctic Atlantic Audubon avian avifauna bearded tit belong Bergmann's rule bird populations bird-watching Britain British birds census clines colonies Cretaceous Darwin's finches decrease described distribution duck ecological eggs England Eocene Europe extinct fauna finches Fisher fossil fulmar gannet geese genera genus geographical goose grebes grouse gulls heron Huxley Iceland important increase interesting invasion islands known large number Leach's petrel Linnaeus living Lockley London long-tailed long-tailed duck Mayr million moas modern Museum natural history naturalist Nearctic nineteenth century North America northern occupied nests Old World original ornithology Palearctic Passeres passerines perhaps period petrel Pleistocene predators present century probably published ratites recorded region rodent rookery scientific sea-birds shows skua South speciation spread stork subspecies superspecies Sweden systematics systematists tern tion tubenoses warbler weather Wetmore wild winter woodpeckers world population Zealand