큰고니 (Whooper Swan)

They breed in the subarctic Eurosiberia, further south than Bewicks in the taiga zone.

Whooper swans pair for life, and their cygnets stay with them all winter; they are sometimes joined by offspring from previous years.

 

Both the male and female help build the nest, and the male will stand guard over the nest while the female incubates. The female will usually lay 4–7 eggs.

 

The cygnets hatch after about 36 days and have a grey or brown plumage. The cygnets can fly at an age of 120 to 150 days.