Polygamie bij Torenvalk Falco tinnunculus

In 2008, a male Kestrel copulated with two females breeding in nestboxes on either side of a bam; both females produced a clutch of 5 eggs, but failed to hatch the eggs because food provisioning of the male was insufficient. Another nestbox, some 150 m away, was occupied by a third female (4 eggs), where only once a male (presumably the same) was recorded. This female incubated for at least 35 days before the clutch was deserted.