The whooper swan, also as the common swan, is a large Northern Hemisphere swan. It is larger, at a length of 140–165 cm and a wingspan of 205–275 cm. Weight typically is in the range of 7–14 kg, with an average of 10–12 kg for males and 8 –10 kg for females.
It is considered to be amongst the heaviest flying birds. Among standard measurements, the wing chord is 56–64 cm, the tarsus is 10–13 cm and the bill is 9 –12 cm. It has a more angular head shape and a more variable bill pattern that always shows more yellow than black. Like their close relatives, whooper swans are vocal birds with a call similar to the trumpeter swan.