Mead, C. J / November 1966 – vol. 59, issue 11–510 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... This article is only available to registered users.To read more, please log in or purchase a subscription.