SIRS,--In view of Mr. Lack's note on t h e repeated re-trapping of Robins (antea, p . 288), I m a y mention t h a t in t h e winter of 1929-30, when a t Cambridge, I had a Sparrow t r a p in t h e garden " baited " with seed. Greenfinches (Chloris ch. Moris) were constantly caught, and one male in particular which was ringed was taken from the trap eleven times in a comparatively short period. As thi...

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