Wobeser G, Gillespie M, Wyatt T
Canadian Cooperative Wildlife Health Centre, Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N 5B4.
J Wildl Dis. 2005 Apr;41(2):463-6. doi: 10.7589/0090-3558-41.2.463.
Two incidents are reported in which groups of migrating wild geese were found dead in agricultural fields in southern Manitoba during spring. In each case, the birds died overnight and poisoning was suspected; however, the birds had lesions of severe traumatic injury. The first incident, in 1985, involved about 150 lesser snow geese (Anser caerulescens caerulescens); the second, in 2003, involved 62 Canada geese (Branta canadensis). Both incidents occurred on dark, moonless nights. One possible explanation is that the birds became disoriented in a manner analogous to spatial disorientation described in aircraft pilots and flew as a flock directly into the earth. In the first incident, geese might have been frightened by sonic booms from aircraft; in the second, there was a thunderstorm with strong gusty winds in the area.
据报道，有两起事件，春季时在曼尼托巴省南部的农田里发现成群的候鸟大雁死亡。每起事件中，这些鸟都是在夜间死亡，怀疑是中毒；然而，这些鸟有严重外伤的损伤。第一起事件发生在1985年，涉及约150只小雪雁（粉脚雁）；第二起事件发生在2003年，涉及62只加拿大雁。两起事件都发生在漆黑无月的夜晚。一种可能的解释是，这些鸟像飞机飞行员所描述的空间定向障碍那样迷失了方向，然后整群直接飞向地面。在第一起事件中，大雁可能被飞机的音爆吓到；在第二起事件中，该地区有一场伴有强阵风的雷暴。
