
Huddled near one stall selling more than a dozen llama fetuses, another hawking porcupine tails and yet another offering bottles of homemade singani, the dangerously potent Bolivian liquor distilled from the muscatel grape, Ponciano Janco motioned to come just a little bit closer. ''I have something for you,'' said Mr. Janco, 45, dipping his hand...