To my knowledge, there is not a single tribe known to survive on a truly vegan diet for any extended period of time (several generations). Jains are generally

To my knowledge, there is not a single tribe known to survive on a truly vegan diet for any extended period of time (several generations). Jains are generally vegetarians, not vegans. There may be some anecdotes that some Jains did live off truly vegan diets, but then again there are anecdotes of people living off sunshine. Neither are plausible.