I saw this small but extremely attractive butterfly flutter down on to a fallen leaf. It preened in the sun, and I got off a shot showing the iridescence in its dark upper wing: you can see the purple colour in the featured photo. Notice the thin tails at the edges of the hindwings? This feature made me think of it as a hairstreak butterfly, and I wasted time looking for an identification. It is actually a copper. It sat on a dry leaf for a short while but opened its wings only briefly. Most of the time it held its wings closed to show the yellow and red underside (photo below).
After I figured that it is the appropriately named Purple Sapphire (Heliophorus epicles) I recalled that I’d seen it a decade ago in the Burapahar range of Kaziranga. Then, as now, I’d seen it resting very low down. It seems to be a widespread resident in the north-east of India, but its Wikipedia article records it from as far west as Himachal Pradesh. I’ve now encountered it twice, in April and May, both times at altitudes of less than 100 meters, far below those mentioned in its Wikipedia article. This article says that it is common in disturbed habitats at the edges of forests, which is in complete agreement with my own few sightings.