But then the team started finding more of these caterpillars, all covered in the body parts of other insects and shed spider skins, and all in the vicinity of spider webs. "We started realizing these things are only hanging out where there are spiders," said Rubinoff, who spent several years verifying that this was, indeed, a rare new species. "It's the sort of thing you really want to be sure of because it's not just incredible, it's unimaginable."