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Tomorrow's Nature contains a paper on "The smallest known non-avian theropod
dinosaur." Xing Xu, Zhonghe Zhou and Xiaolin Wang report on _Microraptor
zhaoianus_ as "the first mature non-avian dinosaur to be found that is smaller
than _Archaeopteryx_, and it eliminates the size disparity between the earliest
birds and their closest non-avian theropod relatives." There are "large
patches of integuments...preserved in situ around the skeleton." "Some pedal
features of _Microraptor_ are consistent with an arboreal habit."