Inland passage of Black Terns in the spring of 1950

THE following report on the inland passage of Black Terns (Chlidonias niger) in the spring of 1950 is based partly on information sent in as a result of an appeal in British Birds (antea vol. xliii, p. 179) and partly on records from the British Trust for Ornithology Wader and Tern Migration Enquiry organised by R. A. Hinde and J. G. Harrison, the full results of which will be published separately...