Cocoons are usually drab and unremarkable. It is the multi-colored caterpillars and butterflies that get all the attention.
As if to disprove a point, something unusual was seen today on a milkweed tree (Calotropis procera) in our neighborhood. Tucked away under a calotropis leaf, I came across one of the most beautiful cocoons I have seen so far.
It is designed as though a jeweler was creating a line of cocoons under the category 'Understated Elegance'. At first sight it looks only neat and compact, like a shapely fruit dangling on the leaf. And then you notice something glinting in the winter morning sunlight - a neat line of golden dots that mark a ridge, and then, a few more of these gilded dots scattered as a parting flourish, on the lower side.
A few days down the line, an Oriental Plain Tiger butterfly will emerge from a tiny hole, just above those golden dots, wait for its crumpled wings to dry and unfurl, and then fly away.
The question that dangles in the air is - why would the butterfly want to advertise its presence, at the most vulnerable stage of its life-cycle, by having such an eye-catching design on its cocoon? What could possibly be the evolutionary advantage of having that gilded design on your sleeping bag?
* Butterflies of India - Oriental Plain Tiger - http://www.ifoundbutterflies.org/sp/744/Danaus-chrysippus
* Calotropis procera -- http://monarchbutterflygarden.net/milkweed-plant-seed-resources/calotropis-procera-milkweed-tree/