Imitative pecking by budgerigars, Melopsittacus undulatus, over a 24 h delay

On video, budgerigars observed a conspecific demonstrator depressing a stopper by pecking or by stepping and then feeding from the box below. The observers were given access to the stopper, immediately after observation or following a 24 h delay, and we recorded the proportion of their stopper removal responses that were made by pecking and by […]