Letter

01 April 1981 Comments Letters Tail shape of Bulwer's Petrel M. R. Alibone commented on the apparent lack of wedge shape to the tail of Bulwer's Petrel Bulweria bulwerii {Brit, Birds 73: 217). In April 1971, I saw several Bulwer's Petrels off the bulge of Africa in the vicin...
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Letters

01 August 1952 Comments Letters SIRS,--The Ibis for April 1953 will include a group of papers on Visible Migration (particularly in passerine birds) as observed in various countries. The newly-formed Sub-committee on Visible Migration of the British Trust for Ornithology (see below) fee...
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