Death of Great Crested Grebe in unusual circumstances

On 26th June 1971, at Rostherne Mere National Nature Reserve, Cheshire, I observed a pair of Great Crested Grebes Podiceps cristatus in what appeared to be normal courtship display. One particular bird was showing a lot of its white underparts while 'false preening'. After a few minutes during which my attention was directed elsewhere, I notic


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