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Tracks were seen by researchers five years ago for the first time since 1959.　　Conservationists nfl jerseyare overestimating the number of species that have been driven to extinction, scientists have said.
　　
　　A study has found that football jerseya third of all mammal species declared extinct in the past few centuries have turned up alive and well.
　
　　Some of the nfl football jerseymore reclusive creatures managed to hide from sight for 80 years only to reappear within four years of being officially named extinct in the wild.

　　The shy okapi – which resembles a cross between a zebra and a giraffe – was first pittsburgh steelers jersey
discovered in the Democratic Republic of Congo in 1901.
　　
　　After increasingly rarer sightings, it vanished from the wildlife radar for decades from 1959, prompting fears that it had died out.
　
　　But five years agotennessee titans jersey researchers working for the WWF found okapi tracks in the wild.
　　
　　Other mammals 'back from the dead' include the rat-like Cuban solenodon, the Christmas Island shrew, the Vanikoro Flying Fox of the Solomon Islands, dallas cowboys jerseythe Australian central rock rat and the Talaud Flying Fox of Indonesia.
　　
　　The revelations come as the world's leading conservationists prepare for a major Unitednew orleans saints jersey Nations summit on biodiversity in Nagoya, Japan, next month.
　　
　　Many scientists believe the world is going through a new 'mass extinction' fuelled by mankind – and that more species are disappearing now than at any timenew york giants jersey
since the dinosaurs vanished 65 million years ago.
　　
　　According to theSan Francisco 49ers jersey International Union for the Conservation of Nature, 22 per cent of the world's mammals are at risk of extinction. In Britain, more than two plant and animal species are being wiped out each year.