Letters

01 April 1967 Comments Letters 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 strengt...
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Notes

01 April 1967 Comments Notes Sand Martins feeding from the ground.--With reference to the notes by Mrs. E. M. Trevor and P. J. Oliver on House Martins Delichon urbica and Sand Martins Riparia riparia apparently feeding from the ground (Brit. Birds, 58: 511; 59: 499), the following ma...
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