A 2005 study by Sankar Chatterjee suggested that the wings of Microraptor functioned like a split-level `` biplane '' , and that it likely employed a phugoid style of gliding , in which it would launch from a perch and swoop downward in a ` U ' shaped curve , then lift again to land on another tree , with the tail and hind wings helping to control its position and speed .
A 2005 study by Sankar Chatterjee suggested that the wings of Microraptor functioned like a split-level `` biplane '' , and that it likely employed a style of gliding , in which it would launch from a perch and swoop downward in a ` U ' shaped curve , then lift again to land on another tree , with the tail and hind wings helping to control its position and speed .
Further information : Origin of birds Dromaeosaurs share many features with early birds ( clade Avialae or Aves ) .