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Construction patterns of birds’ nests provide insight into nest-building behaviours

机译：鸟巢的建造模式可洞悉筑巢行为

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Previous studies have suggested that birds and mammals select materials needed for nest building based on their thermal or structural properties, although the amounts or properties of the materials used have been recorded for only a very small number of species. Some of the behaviours underlying the construction of nests can be indirectly determined by careful deconstruction of the structure and measurement of the biomechanical properties of the materials used. Here we examined this idea in an investigation of Bullfinch (Pyrrhula pyrrhula) nests as a model for open-nesting songbird species that construct a “twig” nest, and tested the hypothesis that materials in different parts of nests serve different functions. The quantities of materials present in the nest base, sides and cup were recorded before structural analysis. Structural analysis showed that the base of the outer nests were composed of significantly thicker, stronger and more rigid materials compared to the side walls, which in turn were significantly thicker, stronger and more rigid than materials used in the cup. These results suggest that the placement of particular materials in nests may not be random, but further work is required to determine if the final structure of a nest accurately reflects the construction process.
机译：先前的研究表明，鸟类和哺乳动物基于它们的热或结构特性来选择筑巢所需的材料，尽管所记录的材料的数量或特性仅针对极少数物种。可以通过仔细地解构结构和测量所用材料的生物力学性能来间接确定嵌套结构的某些行为。在这里，我们在对红腹灰雀（Pyrrhula pyrrhula）巢作为构建“树枝”巢的开放式鸣禽物种的模型的调查中检验了这个想法，并检验了巢中不同部分的材料具有不同功能的假设。在结构分析之前，记录巢基，侧面和杯子中存在的材料量。结构分析表明，与侧壁相比，外巢的底部由明显更厚，更坚固和更坚硬的材料组成，而侧壁又比杯子中使用的材料明显更厚，更坚固和更坚硬。这些结果表明，特定材料在巢中的放置可能不是随机的，但是需要进一步的工作来确定巢的最终结构是否准确反映了施工过程。

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