Vielliard, J, Wagstaffe, R, Shaw, W. D, Longstaff, T. G, Watson, J. B, Oldham, C, Vielliard, J, Wagstaffe, R, Shaw, W. D, Longstaff, T. G, Oldham, C & Watson, J. B / March 1929 – vol. 22, issue 10–267 SIRS,--In connexion with Mr. J. Bartholomew's observation of a Blackbird reaching maturity with a deformed bill (Vol. X X L , p . 69), a somewhat similar case has come under m y notice this winter. In this case it is a n Alpine Chough (Pyrrhocorax graculus) whose upper mandible crosses t h e lower on t h e right side. This Chough is one oj several which come daily t o m y window here for food. I fi... This article is only available to registered users.To read more, please log in or purchase a subscription.