德国西北部城市明斯特的阿湖生活着一只雌性黑天鹅,名叫“彼得拉”。阿湖是明斯特动物园边的一片人工湖,通过一段水道与园内相连,由于湖水清澈、草木茂盛,湖里栖息着不少鸟类。黑天鹅“彼得拉”在一次迁徙中掉队了,便孤独地徜徉在湖内。2006年5月,人们发现,彼得拉常常跟随在一只天鹅形的白色游船后,游人把船划到哪儿,它便跟到哪儿,形影不离。彼得拉盘桓在游船边,甚至不 Lake Ahu, Munster, northwestern Germany, lives with a female black swan named “Petra”. A lake is an artificial lake on the edge of Munster Zoo, connected to the park by a section of watercourse. Due to its clear lake and lush vegetation, many birds inhabit the lake. Black Swan “Pietra ” in a migration left behind, they wandered alone in the lake. In May 2006, it was discovered that Petra often follows a white swan-shaped cruise ship, where visitors are drawn to the boat, wherever he goes, inseparable. Petra stayed by the pleasure boat, not even