THE habit of sun-bathing by passerine birds.is discussed in a note by T. S. Williams (antea, p. 152). As indicated in the Editorial comment thereto this is probably commoner than at first sight appears to be the case. To the list of species given I can add the following: Crested Lark (Galerida cristata) (Belgium and the Balkan Peninsula), Sky-Lark (Alauda a. arvensis), House-Sparrow (Passer d. do...

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