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About the Cover
Cover: A white-beaked dolphin Lagenorhynchus albirostris, swimming in cold Icelandic waters in Flaxifloi Bay, photographed as part of the first effort to catch, test the high frequency hearing, and then release wild free-swimming dolphins (see article by P. E. Nachtigall et al., pp. 642−647). The dolphins heard frequencies as high as 181 kHz but not as high as previously recorded 300 kHz echolocation clicks. This high frequency hearing is as high as any animal previously measured.
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