Ebola" could make the leap from animals to humans creating a pandemic "on the scale of the Black Death”.These zoonotic diseases could number in the thousands, he says, and the destruction of animals' natural habitats is creating more opportunities for them to jump from wild animals into farm livestock and potentially then onto humans.Writing in the Daily Mail, Vidal urges governments to acknowledge the threat of a pandemic as virulent as the Black Death, which killed up to a third of the people in Europe.Vidal spoke to a wide range of experts on the threat of zoonotic diseases.Delia Grace Randolph, co-leader of animal and human health at the International Livestock Research Institute in Nairobi, Kenya, told him: "I think we will get a wave.