UK Daily Mail 
Oct 1, 2010
Conservationists are overestimating the number of species that have been driven to extinction, scientists have said.
A study has found that a third of all mammal species declared extinct in the past few centuries have turned up alive and well.
Some of the more 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 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 ago researchers working for the WWF found okapi tracks in the wild.