有許多具有部分水鳥的特質,因此有假說認為現生鳥類的共祖可能是與甘肅鳥相似的水鳥 。 前肢(pectoral):肱骨、尺骨與前肢骨(英语:Manus (anatomy))(包括掌骨與指骨);後肢(pelvic):股骨、胫跗骨與跗蹠骨 鸟主题 Ji, S.-A. Atterholt, J. O'Connor
201184 . Apesteguía, Sebastián. An Unusual New Theropod with a Didactyl Manus from the Upper Cretaceous of Patagonia, Argentina. PLOS ONE. 2016, 11 (7):
Juárez Valieri R, Makovicky PJ. An Unusual New Theropod with a Didactyl Manus from the Upper Cretaceous of Patagonia, Argentina. PLOS One. 2016, 11 (7):