Original: The first , Rahonavis ostromi ( originally classified as avian bird , but found to be a dromaeosaurid in later studies ) may have been capable of powered flight , as indicated by its long forelimbs with evidence of quill knob attachments for long sturdy flight feathers .
Simplified: The first , Rahonavis ostromi was originally classified as avian bird , but found to be a dromaeosaur in later studies . It may have been capable of powered flight .