They are also found in Europe and Asia. The species winters over parts of its nesting range, but more commonly south through Mexico, Central America, northwestern South America and the West Indies. The nest is built on the ground, often near low shrubs. The eggs are pale blue when first laid but then turn to dull white. They are usually unmarked, although some may be spotted with brown.
Incubation is done by the female.
It begins with the second to fourth egg and lasts for 31 to 32 days. The young are brooded by the female, with the male bringing food and passing it to the female in mid-air. Young harriers can fly about 30 to 35 days after hatching. In years when prey is abundant, harriers are more likely to raise young to the fledgling stage. Unless prey is unusually abundant, the birds do not breed until they are 2 years old.