Status (in CH)
former breeder, regular, scarce migrant, extremely rare summer visitor
The bar on the top line indicates during which seasons the species can be observed regularly in Switzerland. There can be great seasonal fluctuations of numbers. The middle bar indicates the typical migration seasons of a species. The bottom bar indicates the period during which the species normally breeds. As a rule it spans the period from egg-laying to fledging of the young.
Population size in Switzerland (Pairs)
lakes, rivers & streams