What is the largest species of the waterfowl family?

mute swan
whooper swan
tundra swan
trumpeter swan
The trumpeter swan is the heaviest living bird native to North America, and the largest extant species of waterfowl with a wingspan that may exceed 3 m. The largest known male trumpeter attained a length of 183 cm, a wingspan of 3.1 m, and a weight of 17.2 kg. The largest numbers of breeding pairs are found in Alaska.
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Answers by country

mute swan
whooper swan
tundra swan
trumpeter swan
answers
flagthe United States
2%
9%
6%
80%
104
flagAustralia
6%
13%
6%
72%
29
flagGreece
0%
15%
15%
69%
13
flagSpain
0%
16%
16%
66%
12
flagAustria
16%
5%
27%
51%
37
flagFrance
10%
30%
20%
40%
10
flagGermany
33%
6%
20%
38%
176
flagPoland
23%
10%
34%
30%
1440
flagIndia
14%
28%
24%
30%
81
flagSwitzerland
27%
22%
18%
27%
22
flagthe United Kingdom
23%
27%
27%
20%
43
flagRepublic of Ireland
8%
58%
16%
16%
12