BRITISH WARBLERS 



leaves of the different species of Salix will reveal these insects 

 clustering in great numbers, and will at once explain what, 

 at a distance, looks like the aimless pecking at nothing of 

 these birds. 



When inhabiting swamps where the Arundo phragmitis 

 grows, they seem to find, early in the season, a quantity of 

 food amongst the fluffy seeds at the top of these reeds. 



14 



