(with text illustrations by R. GILLMOR). IN July, 1949,1 acquired a juvenile female Magpie (Pica pica) which was fixated on human beings and when adult regarded me as her mate. This bird's behaviour inspired closer observation of wild Magpies for comparative purposes, but I was unable to do any prolonged watching of individual wild birds. By 1951, a certain amount of rather scrappy data had been ga...

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