| Population size in Switzerland (Pairs): 1-3 | Red list 2001:
Vulnerable VU |
Migration behaviour:
partial migrant, wintering birds |
| Body size (cm):
58 |
Body weight (g):
1200-2800 |
Clutch size:
4-6 |
| Nest site:
ground |
Incubation (days):
25-28 |
Nestling stage (days):
65-75 |
| Food:
mussels |
Group:
ducks, swans and geese |
Habitat:
lakes, streams and rivers |
