These are hornworm caterpillars that turn into large moths but I don't know what species they are. They sure got nice and plump from eating the leaves but I am glad to hear that your jasmine plant wasn't destroyed. Amazing photos of them @kaminchan! Thanks for using #butterflyday and #insectpub tags. : ) If you want to be entered in the Giveaway, you must put the link to this post here.