Vervolglegsel bij Wespendief Pernis apivorus?

From a newly built nest in the province of Drenthe, a Honey Buzzard was flushed on 10 July 1980; the nest contained two eggs. The remnants of another egg were found underneath the nest. The broken egg was not fresh and hadn’t been incubated for a long time. A downy chick was seen on the nest on 23 August; another observer saw two nestlings. The last observation of a nestling was on 13 September, when it was practising its wings. The find of an egg underneath the nest and the late fledging date may indicate a repeat-laying. The repeat-layings mentioned in the ornithological literature are critically reviewed. The majority of these statements can not be substantiated and should be refuted as proof of repeatlayings.