The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1941, New Series, Vol. 36, No. 2.
In the reprint in Jungle Comics #42, Kaänga's head is redrawn by Moreira and Zolne's signature is removed.
The story title is taken from the cover blurb.
first line: "Kaänga, jungle lord, and Ann happen on one of the jungle's strangest mysteries."
This story does not follow the continuity established in the last several Camilla stories.