Very young listeners are sure to respond to this pleasurable balance between security and adventure--via a dialogue between Little Fox, who plans to go to the end of the world and confidently expects to cope will all sorts of wild animals and other terrors on the way, and her mother who plays straight man with remarks like ""Oh dear! Won't you be scared?"" And just as attuned to the picture book audience are John Wallner's spanking clear, crayoned illustrations, which make seductive use of the violet tones small artists dote on--to an effect that is sure to elicit pangs of jealous admiration from any kid with a crayola set. Jr. Lit. Gld.