The Display of the Blackbird.--During observations on four pairs of Blackbirds (Turdus merula) in 1949, and on the same four pairs with the addition of another in 1950, the following display was noted. All of the birds concerned were recognizable in the field and no display was noted unless the identity of the birds taking part was known. In the summer of 1950 two of the males were colour ringed....

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