Observational notes on the rearing and behaviour of duikers and other animals (lions, antelopes and a pet cat) in Nigeria. Includes some correspondence. Also an extract from June Hopkins' journal describing a visit to Nairobi National Park Animal Orphanage

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