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European and American wolves howl in distinct ways, and canine vocalisation expert Dr Holly Root Gutteridge has spent her life tracking them to record their calls. Audio: European wolf howl © MacAuley Library, Ronald Schassburger. American Wolf Howl, Dr Holly Root-Gutteridge (Photo: a lone wolf in the snow. Credit: Rory Galloway, ÃÛÑ¿´«Ã½)
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