Microraptor

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Microraptor was among the most abundant non- avialan dinosaurs in its ecosystem, and the genus is represented by more fossils than any other dromaeosaurid, with possibly over 300 fossil specimens represented across various museum collections. [2]423 BROADWAY
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(619)660-2300undescribed Dromaeosauridae
?Late Cretaceous
?North America
Material - (AMNH 86344) (AMNH online)
(MOR 140) teeth (MOR online)
(MOR 157) tooth (MOR online)
(YPM 56980) (YPM online)
(YPM 56999) (YPM online)
(YPM PU 55010) (YPM online)
(YPM PU 55011) (YPM online)

Wiki info

With adult specimens estimated up to 77 centimetres long (2. 53 ft) and with a weight estimated up to 1 kilogram (2. 2 lb), Microraptor was among the smallest-known non-avian dinosaurs. Holtz estimated it at 90 centimetres (3. 0 ft). An estimate by Benson et al. in 2012 was that Microraptor had a maximum length of 1. 2 m (3. 9 ft). Aside from their extremely small size, Microraptor were among the first non-avialan dinosaurs discovered with the impressions of feathers and wings. Seven specimens of M. zhaoianus have been described in detail, from which most feather impressions are known. Unusual even among early birds and feathered dinosaurs, Microraptor is one of the few known bird precursors to sport long flight feathers on the legs as well as the wings. Their bodies had a thick covering of feathers, with a diamond-shaped fan on the end of the tail (possibly for added stability during flight). Xu et al. (2003) compared the longer plumes on Microraptor's head to those of the Philippine eagle. Bands of dark and light present on some specimens may indicate color patterns present in life, though at least some individuals almost certainly possessed an iridescent black coloration. Several anatomical features found in Microraptor, such as a combination of unserrated and partially serrated teeth with constricted 'waists', and unusually long upper arm bones, are shared with both primitive avians and primitive troodontids. Microraptor is particularly similar to the basal troodontid Sinovenator; in their 2002 description of two M. zhaoianus specimens, Hwang et al. note that this is not particularly surprising, given that both Microraptor and Sinovenator are very primitive members of two closely related groups, and both are close to the deinonychosaurian split between dromaeosaurids and troodontids.