DURING the spring and summer of 1944 I spent some time in making a preliminary study of the Willow-Warbler (Phylloscopus t. trochilus), following this in 1945 by a more detailed investigation. It is chiefly on the latter that the present paper is based, but a few interesting 1944 observations (and one from 1943) are also included. The study was made on Englefield Green, Surrey, a gorse and brambl...

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