The Sri Lankan junglefowl (Gallus lafayettii), also known as the Ceylon junglefowl, is a member of the Galliformes bird order which is endemic to Sri Lanka, where it is the national bird. It is closely related to the red junglefowl (G. gallus), the wild junglefowl from which the chicken was domesticated. The specific name of the Sri Lankan junglefowl commemorates the French aristocrat Gilbert du Motier, marquis de La Fayette. In Sinhala, it is known as වළි කුකුළා (wali kukula) and in Tamil, it is known as இலங்கைக் காட்டுக்கோழி (ilaṅkaik kāṭṭukkōḻi).
The male Sri Lankan junglefowl ranges from 66–72 cm (26–28 in) in length and 790–1,140 g (1.74–2.51 lb) in weight, essentially resembling a large, muscular rooster. The male has orange-red body plumage, and dark purple to black wings and tail. The feathers of the mane descending from head to base of spine are golden, and the face has bare red skin and wattles. The comb is red with a yellow centre. As with the green junglefowl, the cock does not possess an eclipse plumage.
The female is much smaller, at only 35 cm (14 in) in length and 510–645 g (1.124–1.422 lb) in weight, with dull brown plumage with white patterning on the lower belly and breast, ideal camouflage for a nesting bird.