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- W2414574851 abstract "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 Dofiana, 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 of different sizes. Ten successful tests were performed between 5th and 13th March. Usually six large and 40 small pieces of bread were scattered over an area about 6 metres square. Several variations were tried involving mixed or separate areas but these did not affect the results. The pieces of bread were cut from slices 0.5 cm thick, the large pieces being 2 cm square (weight 0.7 gm) and the small pieces 0.5 cm square (weight 0.044 S m ) ^ n t n e first four days a few tests were also carried out with bread crumbs and with pieces 1 cm square. I watched from a first-floor veranda some 3 metres above ground level and 20 to 50 metres from the experimental area, using 8.5X and tripod-mounted 20X binoculars. The Jackdaws and Magpies fed over the sandy pasture and in small clumps of palmetto bushes and could be seen to catch craneflies and beetles, turn over dung or dig in sand exposed by the nocturnal rooting of Wild Boar Sus scrofa. Sometimes the birds would appear soon after a test had been set out ; more often there were delays of u p to several hours. As many as eight Jackdaws (median six) and six Magpies (median two) were present during the course of a test and I esti mated that at least six individual Jackdaws and four or five Magpies were actually involved in taking bread. As I got to know some individuals by plumage or behaviour during later experiments it became clear that particular birds returned from day to day over a period of several weeks." @default.
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- W2414574851 date "1975-01-01" @default.
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- W2414574851 title "Feeding and food-hiding responses of Jackdaws and Magpies" @default.
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