The passage of Black Terns Through Britain in Autumn 1954

(Fair Isle Bird Observatory) T H E unusual passage of Black Terns (Chlidonias niger) through the British Isles during the spring of 1954 has been discussed by Dickens (1955)- This was followed by an equally abnormal passage during the autumn. There appears to be no connection between these two events other than that vagaries of the weather happened to throw up conditions tending to bring birds of ...