A study of bird remains from the Koziarnia Cave (Poland) revealed the presence of nearly a dozen bony shreds (snags) projecting from the natural canals in bones; the snags were made of a material that accumulated during the Late Pleistocene. This paper describes this phenomenon and determines the most probable agent responsible for its occurrence by utilizing observations of snag microstructure, taphonomic analysis of bird assemblages from Koziarnia Cave, and surveys of collected bird remains (modern and fossilized). The presence of snag may be a good qualitative indicator of an agent responsible for the accumulation of bird bones at archeological sites and could be useful in future taphonomic studies.

中文翻译：

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障碍在哪里：观察鸟骨

对来自 Koziarnia 洞穴（波兰）的鸟类遗骸的研究表明，存在从骨头中的天然运河中伸出的近十二根骨碎片（障碍物）；障碍物是由晚更新世期间积累的材料制成的。本文描述了这种现象，并通过利用对断屑微观结构的观察、对 Koziarnia 洞穴鸟类组合的埋藏分析以及对收集到的鸟类遗骸（现代和化石）的调查来确定最可能的原因。断屑的存在可能是一个很好的定性指标，表明负责考古遗址中鸟骨堆积的因素，并可能在未来的埋葬研究中有用。