(Eurasian) Coot
Fulica atra
Coots can often be found on lakes, ponds and rivers. They build large nests of pondweeds which decompose and help to keep the eggs warm.
 
  
1: River Aare, Dählhölzli, 21/04/2007.
2: Canal de la Broyle, La Sauge, 28/04/2007.