Specieswatch: 10 to 15 ruddy ducks left in UK after Europe-wide

Introduced from North America in the 1940s, they became a threat to the endangered white-headed duck

High flying duck reaches altitude of 22,000 feet – The Irish Times

Ruddy Duck - British Waterfowl Association

Plucky duck: highest-flying fowl's Himalayan exploits revealed, Birds

Ducks on Placid Lake Focusing on Wildlife

Desert Ducks Focusing on Wildlife

Alien Species in Britain: Ruddy Shelduck (Tadorna ferruginea) – UK Wildlife

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Ruddy Darter (Sympetrum sanguineum)

Details : Ruddy Duck - BirdGuides

Yellowstone's Harlequin Ducks

Ruddy Duck - San Francisco Zoo & Gardens

White-headed ducks and ruddy ducks appear to have very close features which begs the question, when did the two species diverge and what may have been their common ancestor? It's reported that

Ducks on Placid Lake Focusing on Wildlife

Desert Ducks Focusing on Wildlife