Farbfoto
CC BY-Don Graham SA 2.0
http://creativecommons.org/licenses/by-sa/2.0/deed.de
Farbfoto
(CC BY Ingrid Taylar 2.0)
http://creativecommons.org/licenses/by/2.0/deed.de
Farbfoto: Männliche Stockente
CC BY-Fizykaa SA 3.0)
http://creativecommons.org/licenses/by-sa/3.0/deed.en
Farbfoto
CC BY-Sten SA 3.0
http://creativecommons.org/licenses/by-sa/3.0/deed.de
Two habitats meet in this picture: one under the water and on on the bough. This picture shows an ecotone. Salten Langsø, Jutland
Farbgrafik
public domain
http://en.wikipedia.org/wiki/Public_domain