im not sure if a digger wasp is the same thing as just a wasp lol , but i came here to ask the same question because a few minutes ago i was cleaning the dishes when i noticed a wasp and fly stuck...
The Chinese diggers ate rice, and they also farmed their own vegetables. Most likely they paid for meat products or even raised some of their own livestock.
The horse is an herbivor, which means he only eats plant life, grasses mostly. If no grass is available they will need hay and some kind of grain to make sure they get all the nutrition they require....