AndrewHeath
也称为“赫安哲”
Please see the attached photo. Going by bill markings and slight neck length differences, I believe the left swan is a Tundra Swan (Cygnus columbianus) and the right swan is a Whooper Swan (Cygnus cygnus).
However, my field guides also suggest a Tundra Swan should have a "rounder head" and "gentler profile" (Brazil) and the body proportions apart from the necks are not obviously different (MacKinnon, Phillips).
What do you think?
However, my field guides also suggest a Tundra Swan should have a "rounder head" and "gentler profile" (Brazil) and the body proportions apart from the necks are not obviously different (MacKinnon, Phillips).
What do you think?