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Duck - Wikipedia
Guide To British Ducks | Identification Guides | Bird Spot
Duck - Description, Habitat, Image, Diet, and Interesting Facts
The NHBS Guide to UK Duck Identification
Duck Facts, Types, Identification, Habitat, Diet, Adaptations
Duck | Definition, Types, & Facts | Britannica
Duck Bird Facts - A-Z Animals
Ducks, Geese and Swans | BTO - British Trust for Ornithology
Eider Duck Facts | Somateria Mollissima - The RSPB Wildlife Charity
Mallard Duck Facts | Anas Platyrhynchos - The RSPB Wildlife Charity