Page:The British Warblers A History with Problems of Their Lives - 1 of 9.djvu/32

 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.