SIRS,--In concluding his interesting comments under the above title, Mr. David Lack puts several questions (antea, p. 83), and a recent opportunity I have had of watching a t close quarters t h e pairing of Golderests, enables me to give a reply t o one at least of these queries : " Is t h e crest also used in courtship ? " My observation was made near m y home, in the Charente district of south-wes...

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