Goat in Nairobi slum (photo on Flickr by The Advocacy Project).

‘. . . [L]et’s consider what it means to raise urban livestock in the developing world, where people are poorer and hungrier, and cities are much more densely populated. It’s a starkly different picture of people and animals living together, and the question of how it’s done has major implications for improving food security and preventing public health disasters.

‘While humans have been raising food animals in their homes for thousands of years, what’s different now is that they’re doing it with so many other humans crammed next to them.

And they’re not just feeding their families: They’re feeding their neighbors, too. Worldwide, 34 percent of meat and nearly 70 percent of eggs are produced in urban areas, according to a 2008 report by the World Bank and the Food and Agriculture Organization. In Maputo, Mozambique, for example, a…