Mating behaviour of Cuckoos. At approximately 08.00 GMT on 5th June 1986, on an alpine heath, in the vicinity of Ammarnas, south Swedish Lapland, I heard a 'gowk' call and saw two Cuckoos Cuculus canorus approaching in a wild and noisy pursuit flight from the adjacent birch wood. When they came closer, I could see one distinctly smaller individual (female) being chased by a larger one (male). After

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