Gasson, P, Mellow, B. K, Peterson, R. T, Wagstaff, H. G, Lloyd, L. C, Chave, S. P. W, Wilkins, J. P, Dorrien-Smith, A. A, Pounds, H. E, Jourdain, F. C. R, Gasson, P, Mellow, B. K, Peterson, R. T, Lloyd, L. C, Dorrien-Smith, A. A, Jourdain, F. C. R & Pounds, H. E / September 1939 – vol. 33, issue 4–⁠116

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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