During a visit to the Cincinnati Zoo, ANTIQUES ROADSHOW discusses with the U.S. Fish & Wildlife Service how today's endangered rhinos are affected by the antiques trade. Discoveries in "the city that sings" include a suit that belonged to chicken magnate Colonel Sanders; a bronze horse sculpture by Solon Borglum; and an 1846 wall map of the western United States, valued at $11,000-$12,000.