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A study in South Africa has found that human voices cause more fear in wild mammals than the roar of lions. Scientists played recordings of predators and people speaking normally through speakers hidden in the Kruger national park. The study suggests that animals have learnt that contact with humans is more dangerous than contact with lions. Newsday heard more from Liana Zanette - Professor of Biology at the Western University in Canada. “Animals recognise that humans are the most lethal predator out there." (Pic: Elephant on the savannah in Kenya; Credit: Â鶹Éç)