The call to prayer is often followed by offers of more earthly upliftment BESIDE THE food-sellers at a street market in Abuja, a man in a flowing white kaftan holds a brown leather bag in one hand. In the other, well, is a baby crocodile, which he holds out to a potential customer. “Do you want to touch it?” he asks in Hausa, a language spoken in northern Nigeria and surrounding countries, before offering far more than a fondle of a ferocious reptile: medicines for a cold; for chest pain; for a sore back; and to improve sexual performance. Listen to...