From August 1980 to February 1981, following requests (Brit. Birds 73: 267; Bird Life July- August 1980: 40), information on the composition of flocks of tits Parus & Aegithalos was collected by readers of British Birds and members of the Young Ornithologists' Club. In this analysis of the data submitted, the definition of a flock has been taken to be three or more birds, and records of one or
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