Natural history of Victoria. Dec. 6-10 Melbourne,J.Ferres, government printer;1885-90. biodiversitylibrary.org/page/5013504  Upper lobe of a thresher's tail is almost as long as the body! C the crazy caudal fin n #bhlib biodiversitylibrary.org/page/5013504 #SpeciesOfTheDay #SharkWeek