A cuckoo, kukułka or gżegżółka in Polish, is a symbol of how complicated Polish language can be. The word gżegżółka should be read as [ɡʒɛˈɡʒuwka]. 
The bird itself is modelled after "A little cuckoo across a hydrangea", a painting by Taniguchi (Yosa Buson; 1716 - 1784).
Own work
Halibutt