What bird built this nest?
European penduline tit
willow warbler
black redstart 
long-tailed tit
The nest of the long-tailed tit is constructed from four materials - lichen, feathers, spider egg cocoons and moss, with over 6,000 pieces used for a typical nest.
reach: rather globalanimalsbird nestsbirdsornitology
Answers by country
European penduline tit
willow warbler
black redstart 
long-tailed tit
answers
 Sweden
Sweden19
 Greece
Greece10
 the United Kingdom
the United Kingdom31
 Austria
Austria18
 Poland
Poland1521
 India
India33
 Germany
Germany73
 Australia
Australia18
 the United States
the United States74