In 2019, it was listed as a least concern species in the Red List of the IUCN. International trade in B. lidderdalii is restricted under CITES Appendix II. Habitat loss due to excessive felling of forests may be a significant threat regionally. The Thai subspecies, found in northern Thailand around Chiang Mai is considered to be a relict population and hundreds of specimens were collected annually for the specimen. It is now believed to be extinct, probably due to loss of the population and damage to its habitat by forest fire. Habitat Bhutanitis lidderdalii flies from in its Indian range. It generally keeps to the ridges rather than the valleys. Habits Flies at tree-top level, with a slow, drifting, unpredictable flight akin to that of the tree nymph (Idea lynceus). The butterflies transparent greyish underside makes it difficult to distinguish in the shadows. During rain, it sits on leaves with the forewings drooped over the hindwings, concealing its bright upper colouration. The butterfly has a habit of hill-topping and visits flowers of diverse species. Life cycle It is known to have two broods - the first in May and June and the second from August to October. Likely to be unpalatable due to its food plant being Aristolochia species. Food plant Larva on Aristolochia species such as A. kaempferii, A. mandshuriensis, A. griffithii, A. shimadai and A. debilis (Igarashi, 1985, 1989). Cited references See also Papilionidae List of butterflies of India List of butterflies of India (Papilionidae) External links Bhutanitis lidderdalii on Tree of Life website Host plants of Bhutanitis lidderdalii on HOSTS - a Database of the World's Lepidopteran Hostplants. NMNH, London lidderdalii Butterflies of Indochina Butterflies of Asia Insects of Southeast Asia Insects of Thailand Butterflies described in 1873 Taxa named by William Stephen Atkinson