A just-so story, also called the ad hoc fallacy, is a term used in academic anthropology, biological sciences, and social sciences. It describes an unverifiable and unfalsifiable narrative explanation for a cultural practice or a biological trait or behavior of humans or other animals. The use of the term is an implicit criticism that reminds the hearer of the essentially fictional and unprovable nature of such an explanation. Such tales are common in folklore and mythology (where they are known as etiological myths)

《远古传奇》是吉卜林创作的儿童作品中最有名的故事集之一。在吉卜林所有的著作当中，他自己最喜欢的就是这本《远古传奇》。每一个故事都称得上是吉卜林的代表作。他对动物的热爱仿佛与生俱来，并从中获得巨大灵感。本书所收集的大象的孩子、花豹身上的斑点是怎么长出来的、独来独往的猫和其他寓言故事最初是吉卜林讲给他孩子的女护理员听的。前者讲得津津有味，后者听得如痴如醉。这些故事按照主题和描述的环境，从动物讲到字母的起源，从史前山洞讲到非洲热带丛林。本书以离奇而丰富的想象，细腻而生动的描写，讲述着很久很久以前人类与动物的种种变故。