The sub-categories consist of groups of ATU-numbers. The grouping is taken from Aarne, Antti; Thompson, Stith (1964).[1] The individual ATU-number(s) for each article, used to put articles into these groups, come from wikidata and/or the article itself. For example, The Fox and the Crane is ATU type 60.[2] ATU 60 is within the range 1-69: The Clever Fox (Other Animal)[2] which is within the range 1-99: Wild Animals.[2]