Question: do mute swans make noise?
Answer: Mute Swans aren't mute, but their hoarse, muffled trumpet or bugle call given during territorial defense doesn't carry like the calls of other swan species. Mute Swans also make an explosive snorting or hissing when threatened or disturbed. ... When in a group Mute Swans growl, whistle, and snort at each other.