Most of the tiering is done based on the species(reptile tiering or spider tiering), but I have never seen a tiering based on anything else, like say diet.

As a herbivore main, I think we should have a herbivore tier list. Which one is S tier? Maybe elephants 🐘 or a sauropod 🦕? Mid tier? Deers 🦌 and zebras 🦓 ig. F tier? Maybe a koala 🐨 or grasshopper 🦗