The Common Kestrel builds no nest of its own. It nests in old crow nests, on rock ledges, in cavities in buildings and church towers, and in kestrel nest boxes put up for the purpose. The female normally lays 4–6 eggs, and both the eggs and the brood size are adjusted according to the abundance of voles — good vole years produce more young. The female incubates mainly alone for about a month while the male hunts and provides her with food. The young fledge after barely a month in the nest.