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  • 首頁生活隨筆 › 裸鼴鼠的退與進

    裸鼴鼠的退與進

      在非洲肯尼亞等地的草原下,生活著一種裸鼴鼠。它們長得十分難看:全身光溜溜的,皮膚皺巴巴的,長著像豬一樣的鼻子,嘴上兩顆長長的門牙露在外面裸鼴鼠幾乎終生都生活在黑暗的地下,靠挖洞尋找植物的根莖為食,眼睛對于它們,可以說是多余的。    因此,經過長期的演變,它們的眼睛高度退化,幾乎完全喪失了視覺。盡管它們看不見,但是它們在地底下的生存能力卻十分了得:能嗅到距離100米外的根莖的味道。找到食物的方位后,它們就用那兩顆寬長的門牙挖掘前進,猶如挖掘機一樣,一個小時能掘進30余米。除了進化出靈敏的嗅覺外,裸鼴鼠還練就了超強的觸覺能力。在裸鼴鼠的身體兩側,從頭到尾長著大約40根像貓的胡須一樣的長毛。它們并不是皮毛的殘余,而是極其敏感的觸須,觸動其中任何一根觸須,都能讓裸鼴鼠把頭伸向刺激點。地下漆黑一片,裸鼴鼠就是靠這些觸須來辨認方向的:前進時,擺動頭部,后退時,則擺動尾巴,都是為了讓觸須觸摸到隧道壁。由于它們的眼睛高度退化,大腦皮層中負責視覺的區域也大大減小,被改用于負責觸覺了,進一步加強了它們的觸覺感知能力。裸鼴鼠退化了視覺,與此同時,進化出了靈敏的嗅覺和超強的觸覺,從而得以在暗無天日的環境下生存發展。    人們常說,上帝為你關上一扇門的同時,必定會給你打開一扇窗。    在我們的學習和生活中,難免會失去一些東西,比如為了準備考試不能看喜歡的電視劇,比如要去興趣班就無法去郊游。    可是,在我們放棄和失去的同時,也會有新的收獲:我們的成績會提高,我們有了很多的特長短暫的失去并不可怕,因為有退必有進,有失必有得。

    情感專家 蘇

    轉載本站文章請注明出處:嘟比文學網 http://www.yanke0316.com/?p=2487

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