 The primary reason for the proliferation of primitive societies in this area is thought to have been the relative mildness of climate and the abundance of wildlife, which allowed the hunting inhabitants a comfortable life.Archaeological investigations date the decline of the Puerto Hormiga culture and its related settlements to around 3000 BC.The rise of a much more developed culture, the Monsú, who lived at the end of the Dique Canal near today's Cartagena neighborhoods Pasacaballos and Ciénaga Honda at the northernmost part of Barú Island, has been hypothesized.