This small dainty bird is a summer visitor arriving in Britain in early April and spreading over the whole country. Its joyous descending trill may be heard wherever there are trees and bushes, for it finds much of its insect food on leaves and branches.
The nest is built low down, sometimes actually on the ground, and is always well hidden in vegetation. As the summer draws to a close the lilting song changes and gives place to a rather sad plaintive note, and by the end of September few willow warblers are left in Britain.
