Letters

01 January 1979 Comments Letters Thermal soaring of raptors I read D r C. J . Henty's paper on thermal soaring of raptors (Brit. Birds 70: 471-475) with interest, and not a little surprise. I t has long been known by ornithologists that raptors use thermals for soaring, a...
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Letters

01 September 1950 Comments Letters S I R S , -- I n their paper on this subject in British Birds, vol. xlii, p. 325, David and Elizabeth Lack write t h a t Dr. D. A. Bannerman in his note on Chaffinch Migration in .British Birds, vol. xxxvii, p . 177, supposed t h a t the birds he saw in N...
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