There is a movie called King Rat where pow's raised rats and sold them to other pow's, as small deer that grew in Maylasia.
they grow fast and breed....well like rats.
Acorns once the tannin is bleached out are very good and full of fat and nutrients, plus when ground can make a flour. Young ferns (called fiddle head greens) can be very tasty. Water cress as a salad is very good. we have an abundance of wild onions/leeks in the area.....make for a very flatulance producing meal. Notice that during the summer/Fall you can find plenty, winter is another deal.best to save by drying/canning/pickling as much as possible.