In the article, it talks about how they do everything by hand, literally by hand, not using any tools. Why don't they use livestock for their work? It seems ..

In the article, it talks about how they do everything by hand, literally by hand, not using any tools. Why don't they use livestock for their work? It seems ... inefficient. Other countries didn't have electricity for a long, long time; but they still had machines and assistance through livestock and others, what makes this place different?