T H E late F . C. R. Jourdain writing on " Our Present Knowledge of the Breeding-Biology of B i r d s " (antea, Vol. xxiv, p. 135) remarked : "Every detail of the life of the bird is important. For example most valuable and interesting light is thrown on the relationship of the small passerine birds by noting the different shares of the sexes in the choice of the nesting-site and actual building and ...

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