@article{Roerig_2013, title={Shadow boxing by birds - a literature study and new data from southern Africa}, url={https://journals.uct.ac.za/index.php/BO/article/view/190}, abstractNote={Avian shadow boxing can be described as birds attacking, fighting, calling, pecking, displaying or flying at their reflections in mirrors or windows in an attempt to defend their territory against a perceived intruder. For the first time, this study summarizes the literature on this topic; it lists 78 species recorded shadow boxing worldwide}, journal={Biodiversity Observations}, author={Roerig, Joel}, year={2013}, month={Jun.}, pages={39–68} }