The main food eaten by the people comes from fishing, hunting and the collecting of insects. The people are not large eaters of wild plants. Nor do they indulge in the flesh of monkeys, although they do hunt this animal. The economy of the Ifugao is sustained predominantly from agriculture. In fact 84 percent of the income is derived from this source. The remaining sixteen percent comes from the cultivation of aquatic fauna in the rice fields as well as fishing for such things as fish, eels, frogs and water clams. Hunting of deer, wild buffalo, pigs and snakes supplements the income. In previous generations the accepted method of exchange was barter. In more recent times, however, this has been replaced with rice and money. Main imports of the Ifugao are livestock, cotton, brass wire, crude steel and Chinese decorative items. The Ifugao people generally practice a monogamous marriage relationship. Polygamy is, however, practiced among the wealthy in certain tribal groups. In these cases the first wife has higher status than her co-wives.