Dancing Ceylon Tree Nymphs (Idea iasonia). These butterflies are endemic to Sri Lanka. (570k)
Here are the pictures of Ceylon Tree Nymph (Idea iasonia) with links to the pages on which they appear, links to the full sized picture, and the description of the picture with links to the entry in iNaturalist (inaturalist.org)
All pictures are © Dr. Günther Eichhorn, unless otherwise noted.
Sri Lanka Nature
Dr. Günther Eichhorn Travel Website
Soaring website