Notes

01 March 1981 Comments Notes Undertail-coverts of Little Grebe According to the literature, one important distinction between Pied-billed Grebe Podilymbus podiceps and Little Grebe Tachybaptus ruficollis is the white undertail-coverts and vent of the American species. In B...
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Notes

01 September 1939 Comments Notes 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 notice...
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