'I've howled to the wolves and they howled back' says researcher A team of researchers from the UK has developed a computer program that can pick out individual wolves from the sound of their howls with 100% accuracy. It can even identify the wolf's gender and which pack it belongs to. "Now we can be absolutely sure that when we hear a wolf howl we'll be able to identify it just by the way it's using its voice" says PhD student Holly Root-Gutteridge, who led the research. The team from Nottingham Trent University developed a computer program which is unique in that it analyses both volume and pitch of wolf howls, whereas previously scientists had only examined the animals' pitch. Jon Sopel spoke to Holly Root-Gutteridge on BBC World News.