Huffard, Christine L.Caldwell, R.L.2008-09-182008-09-182002-07Huffard CL, Caldwell RL. 2002. Inking in a blue-ringed octopus, Hapalochlaena lunulata, with a vestigial ink sac. Pac Sci 56(3): 255-257.0030-8870http://hdl.handle.net/10125/2557Here we report for the first time that adult Hapalochlaena lunulata (Quoy & Gairnard, 1832), which has a vestigial ink sac, is capable of inking. Ink was released under three different agonistic conditions: female-female aggression, rejection of mating attempt, and when attacked by a predator. We observed no apparent reaction to the ink by the other animals involved in these interactions.en-USArticle