Green has always been an important colour for humans to differentiate - but why? Well: "Green space sweeps the planet. Before skyscrapers and suburbs popped up, our ancestors resided in forested regions full of greenery. As they scavenged for food, the ability to differentiate between colored berries against the backdrop of green foliage was critical for survival. The evolution of eyesight and the increasing ability to detect color with fine detail gave our primate ancestors an evolutionary adva

Join Hazen as he goes in search of a giant reticulated python in the Beung Kiat Ngong swamps, one of the Mekong region's great wildlife havens. Travel along as he takes the journey of a lifetime across the Mekong River Basin, facing remote jungle and flooded plains during the peak of monsoon season. Brand new episodes of Primal Survivor: Mighty Mekong, Tuesdays at 9pm, on National Geographic UK. | National Geographic UK

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