Seems like the Tundras typically have shorter straight necks too.
That’s a good opportunity to get a mental image of the difference
in structure. Side by side like that the difference is obvious but
it can be a real challenge with just one species present.
I don’t often observe Tundra Swans mixed in with Trumpeters. But,
did so yesterday. Neighbor had about 75 Trumpeter Swans in his
field & a group of 6 Tundras came in, landing right next to
the Trumpeters. Very interesting to not only hear each distinctive
call, but also to see the size difference side-by-side. The
Tundras were 3/4 the size of the Trumpeters & looked like
“pencil necks” next to the larger, taller & thicker-necked
-- Cliff and Lisa Weisse Island Park, Idaho cliffandlisa@...