65 species of butterflies have been recorded in the western sector of the forest. These include 2 endemic species and 19 endemic subspecies.

One of the rarest species in Sri Lanka, the Five bar Swordtail, can also be seen during the months of March and April, the season of butterfly migration Of some 65 butterfly species the Blue Mormom (Papilio crino) is the commonest one recorded in the Sinharaja Forest.

Sri Lanka Tree Nymph(Idea lynceus jasonia)

Glassy Tiger(Danaus aglea aglea)

Common Bushbrown(Mycalesia perseus typhlus)

Sri Lanka Red Helen(Papilio helenus mooreanus)

Sri Lanka Five-bar Swordtail(Graphium antiphates ceylonicus)

Sri Lanka Blue Oakleaf(Kallima philarchus philarchus)