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In page Microraptoria:

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Most microraptorians were small dinosaurs, with taxa like Microraptor and especially Zhongjianosaurus being among the smallest non-avian dinosaurs known. However, some microraptorians, such as Tianyuraptor and Changyuraptor, were larger and similar to other dromaeosaurids in size. Many microraptorians also had long and robust arms and legs, in contrast to the stockier eudromaeosaurs, although long arms are not universal to the group since the basal microraptorian Tianyuraptor had unusually short arms by dromaeosaurid standards.[1] Considering this, it is likely that the small size and long wings of some microraptorians are an example of convergent evolution with other small paravians and early birds such as Anchiornis and Archaeopteryx.