Front Matter

Display behaviour and relationships of the Argentine Blue-billed Duck

5-10

A comparison of pursuit flights by six North American ducks of the genus Anas

11-18

Effects of Coots on duck densities in Saskatchewan parkland

19-22

Locations and success of duck nests evaluated through discriminant analysis

23-27

Pond ecology and its influence on Mallard use in Ontario, Canada

28-34

A study of the Abbotsbury Mute Swans

35-47

The pre-nesting behaviour of the Greenland White-fronted Goose

48-54

Time budgets of breeding Mallard in northern Sweden

55-64

Activity budgets of Common Eiders in different housing environments

65-68

Field feeding by dabbling ducks around the Ouse Washes, England

69-78

The importance of food in the determination of the winter flock sites of the Shelduck

79-87

Feeding behaviour of wintering Shelduck on the Clyde Estuary

88-98

The winter food and feeding habits of Shelduck in the Camargue, France

99-106

Food and populations of Surf Scoters in British Columbia

106-116

A review of Bufflehead sex and age criteria with notes on weights

117-122

Geographical variation in the bill patterns of Bewick's Swans

123-128

Geographical variation in the bill patterns of Whooper Swans

129-131

The microstructure of avian eggshells, adaptive significance and practical implications in aviculture

132-136

The waterbirds of Lake Junin, central Peru

137-145

Numbers and distribution of wild geese in the Netherlands, 1974-1979

146-155

Diseases of perching ducks in captivity

156-162

Recent publications of IWRB

163-168

Numbers of swans and ducks in Britain, 1976-77 to 1979-80

171

Numbers of geese in Britain and Ireland, 1980-1981

172

Ringing by the Wildfowl Trust, 1980

173

Wildfowl Trust avicultura! report, 1980

174-175

Publications, 1980, by or with the assistance of Wildfowl Trust staff and facilities

176