O N F O U R O C C A S I O N S in the past eleven years I have noticed Cuckoos Cuculus canorus flying in a rather unusual manner, and I have incomplete notes on what was probably an earlier case of similar behaviour. This method of flight is presumably the same as that briefly mentioned by Chance (1922,1940), but I have been unable to trace any other reference to it in an admittedly far from exhaus...
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