Kat has alerted me to the existence of a (largely) vegetarian spider species. It's name is Bagheera Kiplingi, (a name that will ring a bell for anyone who ever read The Jungle Book, but I digress)
There are several articles about it on the web. I chose this one to link to, because it has a little video of the spider, too.
My interest is piqued about the spider's food, something called beltian bodies, which grow on the leaves of some acacia trees. Ants are the main consumer of these beltian bodies. Now I need to see if I can find them on any of the acacia trees at the arboretum. (the beltian bodies, not the spider. It's native to Mexico and Central America)