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In 2010, palaeontologists studied a well-preserved skeleton of Anchiornis, an averaptoran from the Yixian Formation in China, and found melanosomes - color-determining pigments - in its well-preserved fossilized feathers. Different-shaped melanosomes determine different colours; by analyzing the shape of the melanosomes, they inferred that Anchiornis had black, white and grey feathers all over its body, with only the crest of feathers on its head being red.