Rare butterfly Species sighted

A rare species of butterfly, believed to be extinct, has been sighted and
documented in Assam’s Kokrajhar district.
Researcher Kushal Choudhury who spotted the Yellow-Crested Spangle
(Papilio elephenor), last sighted a hundred years ago, photographed and documented
it at Phipsu in Ripu-Chirang reserve forest in the district.
This is the first-ever photograph of the live species to be taken in the
world after it was first recorded by naturalist C T Bingham in 1907.
Choudhury has been studying swallow-tail butterflies on the north bank
of river Brahmaputra from Sonkosh to Dhansiri river since 2002.