@futurebird @joewynne
this reminds me that there are effectively two examples of herbivory among spiders (often thought to be "enirely obligate carnivores", but no). One is pollen; just about all spiders that build webs can digest pollen, and the other is spiders that live on ant-acacias; ant-acacias grow "treats" to attract ants that protect them from other herbivores. But along comes some canny spiders that have evolved to eat the treats grown for the ants.