Whooper Swan
Cygnus cygnus
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Occasional wild pairs breed in Scotland and even Ireland now, but a colony regularly breeding on Orkney stopped as early as about 1770. Mixed pairs with Mute Swans sometimes reported and up to two dozen feral pairs reported too. Overall less than 5 pairs successful in any year.
Ogilvie, M.A. & RBBP 1999 British Birds: 92, 176-182 & 472-476.
From
The
State of the Nations Birds
Copyright © 2000 by Chris Mead