Dear Marmamers, On behalf of my co-authors, I am pleased to announce a new publication (Short Note) in press, to be published in the journal Aquatic Mammals. Gemmell, G. L., McInnes, J. D., Heinrichs, S. J. & de Silva Wijeyeratne, G. (In Press) Killer Whale (Orcinus orca) Predation on Whales in Sri Lankan Waters. If you would like to receive a copy of the In press PDF, please contact myself (Georgina Gemmell – OPSL Co-Founder and Lead Administrator) at georgina.wildoceans@gmail.com. The official print version will appear in the December 2015 issue of Aquatic Mammals Journal, available only to subscribers. This short note provides the first insight into the dietary habits of the little-known killer whale population seen off Sri Lanka, in the Northern Indian Ocean. Orca Project Sri Lanka, a public-science and Photo ID study of the local killer whale population, received photographs and footage documenting two separate attacks on cetaceans in Sri Lankan waters, these are (1) an attack on a pod of sperm whales (Physeter macrocephalus) and (2) an attack on a mesoplodont beaked whale (Mesoplodon sp.) In addition to these accounts, we also present circumstantial evidence of an attack on a blue whale (Balaenoptera mus¬culus). Among the most significant findings were the predator and prey strategies observed in account (1): the killer whales attacked the sperm whales in an apparent wound-withdraw strategy. All age and sex classes appeared to be involved with the large adult male killer whale playing a pivotal role, delivering the blow that separated a smaller sperm whale from the rest of the herd. The sperm whales did little to defend themselves: their main defensive behaviour was maintaining a tight group on the surface, at times forming a rosette (or ‘marguerite’- heads inwards, tails out) - a behaviour which up until now has only been described from the Pacific and Atlantic Oceans. It is unclear whether any sperm whales were killed in the attack, but the observation of blood and an oil slick on the surface suggest that at least one sperm whale had been injured. Other noteworthy findings include, to our knowledge, the first record to confirm killer whales preying on mesoplodonts (2), which until now were only suggested as prey based on scars consistent with killer whale teeth observed in a beached specimen of M. densirostris. And Account (3), the first strong circumstantial evidence to support killer whales opportunistically preying on blue whales in Sri Lankan waters. Overall, these observations provide crucial insight into the behaviour of this little-studied killer whale population, and also contribute to the overall knowledge available for killer whales preying on large cetaceans. All the best Georgina Gemmell -- *Georgina Gemmell* Lead Administrator, Orca Project Sri Lanka