Eruptions of Great Tits and other species Sirs,--I was interested in Dr. C. M. Perrins's paper on the effect of the seed crop of the beech Fagus sylvatka on the populations and movements of the Great Tit Partis major (Brit, Birds, 59: 419-432). To strengthen his comment (page 422) that the Great Tit fluctuates in a parallel way in areas where there is no beech, I should like to quote some observati...

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