環境教育講座--認識鳥類的的遷徙與往返
Environmental Education Lecture – Understanding the migration and round trip of birds 
你知道鳥類是沒有“國籍”的,它們遷徙的路程很長,往往由這個“國家”飛到另一個“國家”,甚至由一個”洲”飛往另一個“洲”更遠飛過半個地球，他們又是如何準確抵達目的地呢？讓我們一起來理解鳥兒是如何利用GPS定位呢？
Birds have no nationality. They travel a long distance, such as from one country to another, or even fly from one continent to another, moreover, fly far over half of the earth. How did they reach their destination accurately? Let us understand how the bird is flying and positioning with his GPS?
形成候鳥遷徙現象的主要原因不外乎有以下三種:
There are three main reasons for the phenomenon of migratory bird migration::
1. 冰川時期的影響:在冰川時期,地球北大陸多被冰川覆蓋,大批昆蟲、植物死亡,鳥類為了生存,多次被迫向南方遷飛,每次冰川融化後,又遷回它的出生地,久而久之,就形成了鳥類的本能而遺傳下來了。
1. The influence of the ice age: During the ice age, the northern continent of the earth was mostly covered by glaciers, and a large number of insects and plants died. In order to survive, Birds were forced to migrate to the south many times, and each time while the glacier melted, they moved back to their birthplace. Time over time, formed the instinct of birds and inherited it.
2.繁殖地的選擇:鳥類的繁殖地,需要具備豐富的食物和必要的安全條件,越冬地不適宜營巢繁殖,所以每到春天,它們又返回故鄉。
2. Selection of breeding place: The breeding place of birds needs to have abundant food and necessary safety conditions. The wintering place is not suitable for nesting and breeding, so they return to their hometown every spring.
3.生理上的刺激:鳥類的遷徙,在很大程度上是取決於體內所產生的內分泌刺激的結果。
3. Physiological stimulation: The migration of birds depends to a large extent on the endocrine stimulation produced in their body.