The nest is on the ground hidden in dense vegetation, with two to seven (most often three to five) eggs; the eggs hatch after 11–15 days, with the chicks fledging 10–14 days after hatching. Two broods are commonly raised each year. This species is one of the most important nest hosts of the cuckoo, and it is also an important prey species for merlins and hen harriers.
Its food is primarily insects and other invertebrates, mostly small items less than 5 mm (3⁄16 in) long. It also eats the seeds of grasses, sedges, rushes, and heather, and crowberry berries, mainly in winter.
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