Tundra Swan
Cygnus columbianus
C. columbianus is the smallest of the Holarctic swans, at 115–150 cm (45–59 in) in length, 168–211 cm (66–83 in) in wingspan and a weight range of 3.4–9.6 kg (7.5–21.2 lb). In adult birds, the plumage of both subspecies is entirely white, with black feet, and a bill that is mostly black, with a thin salmon-pink streak running along the mouthline and – depending on the subspecies – more or less yellow in the proximal part. The iris is dark brown. In birds living in waters that contains large amounts of iron ions (e.g. bog lakes), the head and neck plumage acquires a golden or rusty hue. Voice: Tundra swans have high-pitched honking calls and sound similar to a black goose (Branta). They are particularly vocal when foraging in flocks on their wintering grounds; any conspecific arriving or leaving will elicit a bout of loud excited calling from its fellows.
ID text from Wikipedia, CC BY-SA 4.0
Whooper Swan
Cygnus cygnus
The whooper swan is similar in appearance to Bewick's swan. It is larger, however, at a length of 140–165 centimetres (55–65 inches) and a wingspan of 205–275 cm (81–108 in). The weight is typically in the range of 7.4–14.0 kilograms (16+1⁄4–30+3⁄4 pounds), with an average of 9.8–11.4 kg (21+1⁄2–25+1⁄4 lb) for males and 8.2–9.2 kg (18–20+1⁄4 lb) for females. The verified record mass was 15.5 kg (34+1⁄4 lb) for a wintering male from Denmark. It is considered to be amongst the heaviest flying birds. Among standard measurements, the wing chord is 56.2–63.5 cm (22+1⁄8–25 in), the tarsus is 10.
ID text from Wikipedia, CC BY-SA 4.0
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