This ancient South American kingdom ran on bird poop
February 11, 2026 3 min read Add Us On GoogleAdd SciAm This ancient South American kingdom ran on bird poop Maize farmers in Peru’s Chincha Valley were fertilizing their crops with seabird poop as early as the year 1250 By Meghan Bartels edited by Andrea Thompson The Isla Balletas is a guano-rich island south of…
