Mystery of empty shell on tree trunks

I have been spotting empty shells of white colour on many tree trunks in Mumbai. I didn’t know what organism made them. This post is summary of journey I took to find out.

The mystery remained unsolved for more than a year, but today another person made similar observation and posted on twitter and an expert commented that these cocoons of moths from Limacodidae family. I cross checked and they look almost similar.

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