In this study, we describe the nest size characteristics and the breeding attempt of Little Crake (Zapornia parva) in the abandoned nest of Common Coot (Fulica atra) at the small mid-field pond in the Masurian Lake District, northeast Poland. Based on the 6-year study during five breeding seasons, we found 123 nests of Little Crake, but such an instance was observed only once. To the best of our knowledge, this observation is the first record of the use of the same nest by two species of rallids. We discuss what could force crakes to make such a decision, why this breeding attempt failed and why such instances are so rare in marsh-nesting species. The nest size in mid-field ponds localized in northern Poland was slightly smaller than that recorded in fishponds in the Czech Republic, but larger than the records obtained in lakes in Germany and Russia.

中文翻译：

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Little Crake 中的巢大小可变性和种间巢重用

在这项研究中，我们描述了小克拉克 (Zapornia parva) 在波兰东北部马祖里湖区小型中场池塘的废弃巢中的小克拉克 (Zapornia parva) 的巢穴大小特征和繁殖尝试。根据5个繁殖季节的6年研究，我们发现了123个小克拉克的巢穴，但这样的例子只观察到一次。据我们所知，这一观察结果是两种 rallids 使用同一个巢穴的第一次记录。我们讨论了是什么迫使克拉克做出这样的决定，为什么这种繁殖尝试失败以及为什么这种情况在沼泽筑巢物种中如此罕见。波兰北部中场池塘的巢穴大小略小于捷克共和国鱼塘中记录的巢穴大小，