Earthen channels that span more than 640 kilometres show that pre-Mayan Mesoamericans built large-scale fish-trapping facilities earlier than previously thought Earthen channels that span more than 640 kilometres show that pre-Mayan Mesoamericans built large-scale fish-trapping facilities earlier than previously thought New Scientist – News
Hunter-gatherers built a massive fish trap in Belize 4000 years ago
