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A very technical paper but what what I found interesting is the process to obtain evidence of color vision among extinct birds . An exceptionally well-preserved extinct enantiornithine fossil bird from the Early Cretaceous Jiufotang Formation (120 Ma) of Liaoning, China, provided the first report of mineralized soft tissue of a bird eye. Cone cells are identified, which have preserved oil droplets that can be compared with an extant house sparrow. The size distribution of oil droplets of extant birds demonstrates good correlation between size and the detectable wavelength range of the cone cells: UV-sensitive cones contain the smallest oil droplets, while red-sensitive cones possess the largest. The data suggests that this Early Cretaceous bird could have possessed color vision. It's amazing what technology can do today. http://www.sciencedirect.com/science/article/pii/S2405844017308587