They are found in thickets, on the forest floor and open scrub. Their loud calls of "Ku-kayak-kyuk-kyuk" () are loud and distinctive, and can be heard in the early mornings and at dusk. Unlike the red junglefowl, the male does not flap its wing before uttering the call. They forage in small mixed or single sex groups. They breed from February to May. They lay 4 to 7 eggs which are pale creamy in a scrape. Eggs hatch in about 21 days. Although mostly seen on the ground, grey junglefowl fly into trees to escape predators and to roost.