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INTRODUCTION Page i
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adult non-breeding Anser Ardeidae areas autumn Bauer and Glutz behaviour belly bill Bill black birds body breast breeders breeding season brood buff calls Camargue Cape Verde Islands chick clutches colonies copulation coverts crown crustaceans culmen dark brown dark grey darker Dementiev and Gladkov dispersal display edges eggs feathers feeding fish flanks fledging flight flight-feathers flocks foreneck grey-brown ground habitat hatching head and neck hindneck Iceland immature incubation inner Islands Juvenile lakes larvae legs less mainly mandible mantle mate migration molluscs mottled moult movements nest Nestling Netherlands nidifugous nominate numbers occasionally outer pair-bond pair-formation pairs paler parents plumage population Post-breeding primaries range roost rump scapulars sexes shorter slightly sometimes species Spitsbergen streaked tail tail-coverts tarsus territory tertials throat tinged underparts upper wing-coverts upperparts USSR usually uttered Volga delta webs West Germany west Palearctic wing wing-coverts winter Witherby yellow