就像人类会囤积零食独自享用,松鼠也习惯把吃不完的种子偷偷藏起来。科学家估计,一只松鼠每年都会搜集到大约一万颗种子,再分别埋在不同的地方,而且和整天找不到遥控器,总是想不起来雨伞掉在哪里,或忘记口袋里塞了200块的你不同,松鼠可以找回大多数亲手埋藏的种子。但一万颗种子到底要怎么记?实验发现,松鼠可能是使用类似「分组记忆」的方式,把种子按照大小或美味程度,分成不同组别 (比如核桃杏仁一组、瓜子葵花籽一组),再一组一组画进脑海中的藏宝图,所以即使坏心眼的科学家将松鼠私藏的大祕宝偷偷挖出来,并抹除气味、制作假土堆来误导办案,松鼠依旧有办法找到正确的埋藏地点,证明牠们的确长著过人的记性。然而,松鼠终究不能精准掌握库存,少部分被牠们遗忘、或来不及吃掉的种子,一经冬去春来,就会在土壤里苏醒、发芽,于是松鼠便无心插柳地为地球多种了一棵树。这个健忘的后果不只浪漫、还十分环保。
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