Jim Brandenburg / Tundra Swan (Cygnus columbianus) trio flying against cloudy sky, Minnesota
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Jim Brandenburg / Tundra Swan (Cygnus columbianus) flock taking off from lake, Mattamuskeet National Wildlife Reserve, North Carolina
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Nick Upton / Bewick's swan (Cygnus columbiana bewickii) flapping its wings as it stands on a frozen marshland pool, Gloucestershire, UK, February.
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Nick Upton / Bewick's swan (Cygnus columbiana bewickii) sliding on ice as it lands on a frozen marshland pool with other swans and Canada geese (Branta canadensis) in the background, Gloucestershire, UK, Febru...
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Nick Upton / Bewick's swan (Cygnus columbiana bewickii) sliding on ice after landing on a frozen marshland pool, Gloucestershire, UK, February.
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Nick Upton / Bewick's swan (Cygnus columbianus bewickii) in flight overhead, Gloucestershire, UK, February.
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Nick Upton / Bewick's swan (Cygnus columbianus bewicki) preening as it stands in a freshwater lake, Gloucestershire, UK, February.
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Nick Upton / Bewick's swan (Cygnus columbianus bewicki) calling as it bathes on a freshwater lake, Gloucestershire, UK, February.
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Nick Upton / Bewick's swan (Cygnus columbianus) adult pair with one wearing a GPS logging neck collar for satellite tracking of migratory movements, WWT Slimbridge, Gloucestershire, UK, February.
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David Kjaer / Bewick's swan (Cygnus columbianus) in flight with rainbow, Gloucestershire, England, UK, February.
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David Kjaer / Bewick's swan (Cygnus columbianus) in flight with rainbow, Gloucestershire, England, UK, February.
