PROOF of the sex of the bird choosing the nesting-site is generally so difficult to obtain that it seems worth while to record some evidence in the case of a House-Sparrow (Passer d. domesticus) in my garden in the spring of 1939. Early in March I noticed for several days a male Sparrow sitting on the top of a nesting-box or in a tree within a foot or two of it and chirping continuously about a d...

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