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Mute swan - Wikipedia
Mute Swan Overview, All About Birds, Cornell Lab of Ornithology
Mute Swan Identification - All About Birds
Mute Swan | Audubon Field Guide
Mute Swan Life History - All About Birds
Mute Swan - eBird
Mute Swan - Cygnus olor - Birds of the World
Mute Swan - Facts, Diet, Habitat & Pictures on Animalia.bio
Mute swan - The Wildlife Trusts
Cygnus olor (mute swan) - ADW