 
 <prompt> Wetin be di main group wey you fit trace back birds wey we dey see today? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```Early synapsid mammalian ancestors na sphenacodont pelycosaurs, one group wey produce the non-mammalian Dimetrodon. At the end of the Carboniferous period, this group branch off from the sauropsid line wey lead to reptiles and birds wey we get today. The line wey follow the stem group Sphenacodontia split into different groups of non-mammalian synapsids wey sometimes dem dey call mammal-like reptiles before e come give rise to the proto-mammals (Therapsida) for the early Mesozoic era. The modern mammalian orders come out for the Paleogene and Neogene periods of the Cenozoic era, after the extinction of the non-avian dinosaurs 66 million years ago.``` 