Indeed, nowhere have humans attempted to survive without at least some of the innumerable goods and services that animals render.
Animals feed people and soils.
They generate incomes. They are the major capital asset of smallholder farmers. They reproduce themselves under even the harshest conditions. They are highly specialized eaters of grasses and similar vegetation that grow not only on range lands, which make up two-thirds of the earth's agricultural lands, but also on and near croplands. They convert these organic materials, which are indigestible by people, into human food of the highest quality.