科普專欄–薯不揀單 - 三十秒科學–自割

自割 (Autotomy)是一種動物求生的本能，其中的例子包括壁虎斷尾，螃蟹斷臂等等。501Please respect copyright.ＰＥＮＡＮＡI3GrFMJWTk
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過一段時間後，器官便會再生回復至原來的樣貌，其體積有機會比原來的更為細少。501Please respect copyright.ＰＥＮＡＮＡu4aGfZpay7
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（圖2）有科學家嘗試用尼龍蠅綁住海蛞蝓(Sea Slug)的頸部，發現牠們有能力進行自割，頭身分離。501Please respect copyright.ＰＥＮＡＮＡzLOekvnFyA
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有情況甚至是頭部與心臟、大腸、性器官等分離。而其脫離的頭部則吃著海藻維生。501Please respect copyright.ＰＥＮＡＮＡlRUacuu9a8
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7日後，頭部發展出心臟等器官。約20日後，所有器官亦能順利發展成為原狀，又一條好漢。501Please respect copyright.ＰＥＮＡＮＡ0baSf4DERg
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至於被遺棄的身體，則隨著時間變得暗淡及萎縮，沒能長出頭部。501Please respect copyright.ＰＥＮＡＮＡrHsbwjlreh
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（圖3）自然情況下，當海蛞蝓遭受到寄生蟲入侵時，進行自割並頭身分離的情況亦會發生。501Please respect copyright.ＰＥＮＡＮＡI4kLsvpTEC
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鑑於這情況的發生，有理由可相信海蛞蝓進行自割是天生用來對抗外敵入侵的手段。501Please respect copyright.ＰＥＮＡＮＡMIaFUrM4ta
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此地不宜久留之時，若有逃生門手段可走，自然界的生物自當會不惜一切進行逃離。501Please respect copyright.ＰＥＮＡＮＡUiws5ZEAQv
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Ref1:https://www.cell.com/current-biology/fulltext/S0960-9822(21)00047-6501Please respect copyright.ＰＥＮＡＮＡnTcRoGniJS

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