Here is a cover from Finland with a stamp showing a pair of Mallards (Anas platyrhynchos).  This species of dabbling ducks can be found in wetlands in temperate and subtropical Europe, North Africa, Asia and America.  It was also introduced in Australia and New Zealand.  As you can see on the stamp the green-headed male is different from the brown and colour-lacking female.  This species feed on water plants, invertebrates, gastropods, worms etc.  It is migratory.

The stamp was issued in 2010.

Here is a nice cover from Finland.  It appears to be both hand and machine canceled.  The 2003 bird stamps shows Eurasian Capercaillie (Tetrao urogallus) which I have presented in the past.

A nice cover from Finland with pictorial postmarks. The bird stamp was issued in 2002. Whooper Swan (Cygnus cygnus) is a large swan which lives in wetlands in subarctic Europe and subarctic Asia. It migrates in eastern Asia and northern Europe.