Transport infrastructures, mainly roads and railways, influence many aspects of bird life. The use of trams in urban areas for mass transit has been suggested as having a lower impact on the environment. However, to date, the impact of tram tracks and the surrounding infrastructure on birds has not been directly tested. Therefore, we posed two questions during a study of tramways in Poznań (western Poland): (1) which bird species use tram tracks and their infrastructure; and (2) how does their behaviour respond to moving trams. Tram tracks were recorded as used by 11 species, with four corvids (jackdaw Corvus monedula, rook Corvus frugilegus, magpie Pica pica and hooded crow Corvus cornix) totalling 66% of records and feral pigeon Columba livia contributing a further 24%. Species showed different usage patterns of the tram infrastructure. In the case of rook during winter, significantly more birds were observed further from a tram stop. In summer, a higher density of jackdaws occurred where track surroundings were vegetated, and both hooded crows in winter and magpies in winter were more abundant where track geometry was more complex. During our field work only two dead birds on tram tracks were observed. The results of this study, and a literature survey of other transport options, suggest that tram tracks are not very dangerous for birds, and at least from this point of view, can be recommended as an environmentally friendly transport system in urban areas.

运输基础设施（主要是公路和铁路）影响鸟类的生活。有人建议在城市地区使用电车进行大众运输对环境的影响较小。但是，迄今为止，尚未直接测试电车轨道和周围基础设施对鸟类的影响。因此，在波兹南（波兰西部）的电车轨道研究中，我们提出了两个问题：（1）哪种鸟类使用电车轨道及其基础设施；（2）他们的行为如何应对电车行驶。记录电车轨道13759 11种，具有四个鸦科（寒鸦乌鸦monedula，车乌鸦frugilegus，鹊喜鹊和罩住乌鸦乌鸦cornix）共计的记录和野鸽66％Columba livia贡献了另外24％。种类显示了电车基础设施的不同使用模式。就冬季的车鸦而言，在电车站附近观察到的鸟儿明显更多。夏季，在履带环境被植被覆盖的地区，寒鸦的密度更高，冬季，带帽的乌鸦和冬季的喜都更为丰富，而履带的几何形状则更为复杂。在我们的野外作业中，仅观察到电车轨道上有两只死鸟。这项研究的结果以及对其他运输方式的文献调查表明，电车轨道对鸟类不是很危险，至少从这个角度来看，可以建议将其作为城市地区的环保运输系统。