Bewick's Swan vs Coscoroba Swan

Bewick's Swan and Coscoroba Swan can be distinguished most reliably by their bill and plumage. Bewick's Swan has a distinctive yellow and black bill, while the Coscoroba Swan features a bright red bill. Additionally, their plumage and size differ significantly.

Bill color is the most reliable field mark: Bewick's Swan has a yellow and black bill, whereas the Coscoroba Swan has a bright red bill. Size can also help: Bewick's Swan is larger.

Bewick's Swan is larger than the Coscoroba Swan.

Bewick's Swan is primarily white with a yellow and black bill, while the Coscoroba Swan is also white but has a bright red bill.