The sun was moving down rapidly. In the last light of the day, I had my first sighting of the butterfly called the Knight (Lebadea martha). It was exactly where you might expect to find it: just over a meter from the ground, basking near an open patch of ground. I took a photo of this battle-scarred veteran. I learnt of the interesting eating habits of its caterpillar later. I also found afterwards that Assam in April is when you are most likely to find it in India. Detailed ecological studies are absent in India; they come from elsewhere in south-east Asia.
Amazingly, there is extensive scientific literature on the structure of the Knight’s wings in the field of nanomaterials. It’s almost as if Bruce Wayne was working on his armour. Wings of butterflies are made of a material called chitin, microscopically organized in very cleverly stacked scales. Chemists found that by treating the wings of a Knight, they could make wearable biosensors which could make very sensitive chemical analysis of people’s perspiration. Could a future version of a fitbit made of the wings of this butterfly provide early medical warnings for everyone?