I know this would vary from locale to locale, but, presumably, there are some animals that do not require a permit to kill (mice in mouse traps, for example). How does this work? Is there a list of "always OK to kill" species?
Eating a rabbit only diet leaves you lacking fat, not vitamins. I mean probably vitamins too but the lack of fat in rabbit meat is what kills people who feed on it exclusively. It's called rabbit starvation or protein poisoning.