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Dr Zuckerman's report on investigations carried out in the Gardens of the Zoological Society of London, such as studies of reproductive cycles, individual and social behaviour, and perception and cognition

Correspondence with Professor K Lorenz regarding a grey lag, a jackdaw and a mallard to be taken to Lime Grove, a paper on the ethology of the European Bullfinch by Dr Jurgen Nicolai, and a request for bullfinches from Calcutta