This section is from the book "The Balance Of Nature And Modern Conditions Of Cultivation", by George Abbey. Also available from Amazon: The Balance Of Nature And Modern Conditions Of Cultivation.
The Chiff Chaff (Phylloscopus rufus or Sylvia rufa) belongs to the Sylvinae or True Warblers, sometimes also called Luscininae. It is a small species, attaining a length of 4 or 5 in. Its colour is brown on the upper parts and white on the under. It arrives in England in March and departs in October. It inhabits woods and thickets. The nest is placed near the ground in a bush or resting on a hedgebank, and is rounded or oval and entered by a hole at the side. The eggs are six in number, speckled with purplish-red on a white ground. It destroys large numbers of insect larvae, feeding largely on the leaf-rolling caterpillars, especially those of the cak-green moth.