Date: 3/11/17 9:24 am From: Tim Johnson <tim.the.fisherman...> Subject: [obol] Re: Swan ID
Another thing to consider when identifying swans, the trumpeter is a much larger swan than the tundra. Sibley's field guide shows the trumpeter size as follows: Length 60", Wing Span 80", Weight 368 ounces. Compare that to the tundra: Length 52", Wing Span 66", Weight 230.
It helps if the all the swans being identified are mixed together. If there are any trumpeter swans in the mix they should be significantly larger than the tundras.
My experience is that the tundras and trumpeters don't form mixed flocks, however my experience seeing them together is fairly limited.