The world is becoming less colourful. Across #Brazil and much of the #tropics, #butterflies are fading as #forests give way to industrial #plantations. Once vibrant with flashes of red, blue and gold, their wings are now turning brown and grey. New research shows that colourful #species struggle to survive in eucalyptus plantations where the #light is harsh, the #air is dry and the forest floor is stripped bare. The result is an eerie quietness.