它们对人造电子设备的疯狂，也许正是这种自然能力进化中一个偶然的副产品。
Their attraction to man-made electrical devices may be an accidental evolutionary byproduct of this natural ability.
作者提出，使提高的学习能力进化可能需要神经系统消耗更多用来延长寿命的资源。
The authors suggest that evolving an improved learning ability may require a greater investment in the nervous system which diverts resources away from processes that stave off ageing.
因此只有用统计的方法，对更加广泛的现有动物的识数水平进行调查，人们才有希望了解动物识数能力进化的基本前提。
Only by studying the numerical abilities of more and more creatures using standardised procedures can we hope to understand the basic preconditions for the evolution of number.
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