Did you know Mute Swans aren’t actually mute? While they’re quieter than other swan species, Mute Swans do have eight or nine distinct vocalizations. From the moment they hatch, cygnets use soft cheeps to communicate with their parents and siblings. As they grow, these sounds evolve. Adults develop a variety of calls, including a sharp bark-like sound used to alert or call to their mate and young. In this video, you’ll see a juvenile experimenting with her adult voice. It doesn't sound quite rig

Tundra Swan Identification, All About Birds, Cornell Lab of Ornithology

Whooper or common swan call, bird sounds Cygnus cygnus