If a person were comparing Trumpeter Swans with Tundra Swans, which of the following notes would be important?
A.
Trumpeter Swans have a deep, trumpet-like call.
B.
Trumpeter Swans have white feathers and black bills.
C.
Trumpeter Swans weigh about 21-30 pounds.
D.
Trumpeter Swans that are males are called cobs.