A Comparative Study of the Voice and Some Aspects of Behaviour in Two Old-World Jays 1)

A COMPARATIVE STUDY OF THE VOICE AND SOME ASPECTS OF BEHAVIOUR IN TWO OLD-WORLD JAYS 1) by DEREK GOODWIN (Virginia Water, England) (With 8 figs) (Rec. 1-IX-1952) INTRODUCTION Since 1946 I have been carrying out observations on the jay Garrulus glandarius. For the most part this has been on hand-reared captive birds, and on wild ones living about Virginia Water, Surrey, and in Kensington Gardens, London. An account of much of this work was written up in the winter of I949?5o and published in the Ibis for ig5i. For the past eighteen months I have also kept captive specimens (but