格日勒鸟的化石包括三个骨头部分。完模标本是右肱骨的近端部分，编号PIN 4499-12。副模标本是左肱骨的远端部分，编号PIN 4499-14；最后的副模标本是左喙突的肩膀端，编号PIN 4499-13。所有三个化石都存放在俄罗斯科学研究院（The Paleontological Institute of the Russian Academy of Sciences）。肱骨的头阔约29毫米，而白垩纪早期最大型的反鸟亚纲是鹏鸟，其肱骨的头也只有17毫米阔。[3]故此格日勒鸟可能是整个白垩纪中最大型的反鸟亚纲成员。
^Kurochkin, E.N. A new large enantiornithid from the Late Cretaceous of Mongolia. I. Darevskii and A. Averianov (editors) (编). 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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