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Moth Caterpillars


These caterpillars come down from a pine tree in a column in the morning to feed and go back up again in a column at night. They must derive some kind of protective benefit of going about their lives in a crowd. Army worm moth caterpillars?


Pine trees in the garden. Semi-urban area on the outskirts of San Cristobal.


I think these are the ones that make an irregular nest-like structure in which they pupate in mass. They all emerge as adults at the same time and the empty nest thing eventually falls down to the ground. I will add a picture of it, but I am not positive it is the same species. The consistency of the nest is like that of a paper wasp and grey in color. I have dissected one open and it was full of pupal cases of moths.

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Spotted by

San Cristóbal de Las Casas, Chiapas, Mexico

Spotted on Jul 25, 2006
Submitted on Sep 7, 2012

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