Fault-bars as a means of ageing birds Sirs,---Last year I read a letter by C. J. Mead on the ageing of birds by means of fault-bars (Brit. Birds, 58: 227-228), in which he referred to the work of W. E. Glegg who noted fault-bars on the tails of 737 bird skins (Ibis, 86: 511-516). But Glegg, who probably did more work on fault-bars than anyone else in this country, was unable to find any correlatio...

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