Once all eggs have been laid, the pen incubates them for about 32-37 days, and the cob protects the nest, vigorously chasing away all intruding swans or predators. The adults perform a “triumph display” after intruders are repelled. Facing one another, they quiver their wings and trumpet loudly.
Cygnets leave the nest within 24 hours of hatching and have the ability to swim and feed. They fledge at about 90-120 days of age.