hello, furry here.
Therians are people who believe they are an animal, they are technically separate i think but theres a big overlap. generally decent folks that get teased too much.
the big tell with the litter boxes thing is furries sell out some of the largest convention centers every year and extensively share photographs of the place. no litterboxes in sight.
mushrooms!
https://phys.org/news/2010-04-lightning-mushrooms.html
they arent plants tho.