格日勒鳥的化石包括三個骨頭部份。完模標本是右肱骨的近端部份，編號PIN 4499-12。副模標本是左肱骨的遠端部份，編號PIN 4499-14；最後的副模標本是左喙突的肩膀端，編號PIN 4499-13。所有三個化石都存放在俄羅斯科學研究院（The Paleontological Institute of the Russian Academy of Sciences）。肱骨的頭闊約29毫米，而白堊紀早期最大型的反鳥亞綱是鵬鳥，其肱骨的頭也只有17毫米闊。[3]故此格日勒鳥可能是整個白堊紀中最大型的反鳥亞綱成員。
^Kurochkin, E.N. A new large enantiornithid from the Late Cretaceous of Mongolia. I. Darevskii and A. Averianov (editors) (編). Materials on the History of Fauna of Eurasia. Zoological Institute of the Russian Academy of Sciences, Saint-Petersburg 277. 1999: 132–47. QL1 .A4253 v.277.
^Clarke, Julia A., Norell, Mark A. New Avialan Remains and a Review of the Late Cretaceous Nemegt Formation of Mongolia. American Museum Novitates. 2004, 3447: 12pp.
^"Zhonghe Zhou, Julia Clarke, Fucheng Zhang. Insight into diversity, body size and morphological evolution from the largest Early Cretaceous enantiornithine bird. Journal of Anatomy. 2008, 212: 565–77. doi:10.1111/j.1469-7580.2008.00880.x.
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