IN May, 1947, a pair of Wood-Warblers (Phylloscopus sibilatrix) arrived in an area of Englefield Green, Surrey, where a pair had nested in at least the previous vear. The iq46 pair is referred to in May's " Studies on a Community of Willow-Warblers (Phylloscopus trochilus)" (1949) in the same area, where it is observed that their territory was ecologically distinct from that of the other species. The...

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