I HAVE previously (antea, Vol. xxxiii, p. 265) given examples from the Robin (Erithacus rubecula) and the Blackcock (Lyrurus tetrix) of a male attempting to disturb the coition of another pair. Similar behaviour is characteristic of geese and swans, as noted particularly by Heinroth (Verh. V. Int. Orn. Kong., 1910, p. 658). It has also been recorded in the Rook (Corvus frugilegus) by Yeates (TheL...

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