Mute swans in flight. Mute swans are an agressive invasive species. There are now over 3,000 mute swans in the Maryland portion of the Chesapeake Bay. They are easily distinguished from the tundra swan by theirorange beaks.
Photographer: Mary Hollinger
Affiliation: NODC biologist
Date: 2000 July 23
Location: Maryland, Chesapeake Bay
Subject: Chesapeake Bay Maryland