Dear colleagues, I'm pleased to announce the recent online publication of an article entitled "Evidence for simultaneous sound production in the bowhead whale (Balaena mysticetus)," in The Journal of the Acoustical Society of America (Vol. 130, Issue 4). You can access the article via this link URL: http://link.aip.org/link/?JAS/130/2257 DOI: 10.1121/1.3628327 or by contacting ote@science.ku.dk Abstract Simultaneous production of two harmonically independent sounds, the two-voice phenomenon, is a well-known feature in bird song. Some toothed whales can click and whistle simultaneously, and a few studies have also reported simultaneous sound production by baleen whales. The mechanism for sound production in toothed whales has been largely uncovered within the last three decades, whereas mechanism for sound production in baleen whales remains poorly understood. This study provides three lines of evidence from recordings made in 2008 and 2009 in Disko Bay, Western Greenland, strongly indicating that bowhead whales are capable of simultaneous dual frequency sound production. This capability may function to enable more complex singing in an acoustically mediated reproductive advertisement display, as has been suggested for songbirds, and/or have significance in individual recognition. Best wishes, Outi Tervo et al. Outi Tervo, PhD Arctic Station 3953 Qeqertarsuaq Greenland http://arktiskstation.ku.dk/ http://diskobayarcticstation.wordpress.com/