Leader, P. J, Dunn, J, Batchelor, I. R. C, Gooch, B, Gibson-Hill, C. A, Knowles, C, Hohn, E. O, Hope, J, Southern, J, Turner, L. L, Ryves, B. H, Shaw, A, Leader, P. J, Southern, J & Dunn, J / February 1948 – vol. 41, issue 2–61 DURING the years 1946 and 1947 I have noticed several species singing outside what appears to be their normal song-period as defined in The Handbook charts. Some of these variations are considerable, others less so. The particulars are as follows :-- NUTHATCH (Sitta europcea dffinis). A bird heard in quite good song on July 22nd, 1947, near Llangollen, N. Wales. Birds heard in song subsequently i... This article is only available to registered users.To read more, please log in or purchase a subscription.