| animal displacement The habit of many animal species of moving inside their habitats or of travelling, during migrations, to different biotopes, often considerable distances apart; in aquatic environments displacements can occur horizontally or vertically while in terrestrial environments animal populations that breed in the alpine or subalpine zones in summer, move to lower levels in winter; animal displacements usually follow circadian rhythms and are related to the necessity of finding breeding, resting and feeding areas | 动物位移 (许多动物有迁入其栖息地或经过长途旅行迁移到别的生态环境中的习性。在水生环境中的动物位移通常是水平或垂直方向上的；而在陆生环境中，夏季在高山带或亚高山带繁殖的动物群体会在冬季迁移到较低的地方；动物位移通常遵循其生理周期，同时也与它们是否有必要寻找繁殖、休眠和捕食地有关。) |
