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Megazostrodon
''Megazostrodon'' is an extinct Mammaliaform that is widely accepted as being one of the first mammals and which appeared in the fossil record approximately 200 million years ago.〔(Fur and Fangs: Mammal Origins ). Palaeobiology and Biodiversity Research Group, University of Bristol.〕 It did have some non-mammalian characteristics〔''some should be mentioned''.〕 but they were sufficiently minor to warrant the analysis that this animal probably represents the final stage of the transition between cynodont, or "mammal-like" reptiles and true mammals.〔(''Historical Biology''. 1992, vol. 6 p.186 )〕
==Characteristics==
''Megazostrodon'' was a small, furry,〔Its fuzziness is extrapolated from the fact that its skeletal morphology implies a warm-blooded animal with a high metabolism, and warm-blooded animals are covered with insulatiing features like feather, down, or hair in mammals.〕 shrew-like animal between long which probably ate insects and small lizards. It is thought that it was nocturnal as it had a much larger brain〔 than its cynodont relatives and the enlarged areas of its brain were found to be those that process sounds and smells. This was probably in order to avoid being in competition with the reptiles or becoming prey to the dinosaurs.〔(Smithsonian Science Abstract )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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