In early March 1973 I was trying to train wild Jackdaws Corvus monedula and Magpies Pica pica to come to an area of sandy pasture close to the research buildings of the Estacion Biologica de Doñana, southern Spain, so that I could perform experiments on their searching behaviour. This general training period presented a good opportunity to investigate in detail the birds' responses to food items o

...

Stay at the forefront of British birding by taking out a subscription to British Birds.

Subscribe Now