Arriving first at the breeding site, the males return to their usual nest site and begin to sing immediately, defending their territory. Later, the females arrive to mate, selecting a male for the season based on his singing voice. The nest is constructed on the ground between young jack pines in late May, in time for egg-laying between late May and mid June. From three to six eggs are incubated by the female for 14 days, during which time the male brings food to his partner. After hatching, both parents tend to the chicks, each tending to only half the brood, which disperse just 9 or 10 days later (4). Kirtland's warbler feeds mainly on flying insects, although it also consumes pine needles, grasses and blueberries (4).