Emperor Moth, Opodiphthera eucalypti

“The moth having emerged from the chrysalis ... keeps working ... at one end of the cocoon, moistening it all the while with some liquid and causing a noise similar and equally loud to that domestic nuisance the Rat. This operation is continued for about an hour.” Description from AW Scott, ‘Australian Lepidoptera and their Transformations’, Volume 2, Plate 10 (1890-1898).