Trumpeters and Tundras are similar looking species that are more difficult to identify. Reports from wildlife observers will help biologists monitor the recovery of Trumpeter Swans. Positive identification is essential, as Trumpeters often mix with flocks of the relatively common Tundra Swan throughout their migration and winter range. Distinguishing Trumpeters from Tundras is not easy, but it is possible by paying close attention to a few distinctive characteristics. If that description is a bit hard to get your mind around, you can hear a Tundra Swan call in flight.
Trumpeters have an unmistakable resonant, loud, trumpet-like call.
I wonder how they got the name Trumpeter Swan. However, their grunts, snorts, and quiet whistles cannot be confused with the distinctive calls of Trumpeter and Tundra Swans. Size Trumpeters are much larger than Tundra Swans and slightly larger than Mute Swans. These size differences may be difficult to use as distinguishing features unless two species are side by side or seen at very close range. To most people, any swan is BIG .