这些动物的生命力比人类想象的要顽强，仍未灭绝

1/3的曾被预测或宣布已灭绝的动物，它们的生命力比人类想象的要顽强得多，至今仍未灭绝。人类确定的自16世纪以来走向灭绝的哺乳动物有187种。然而有67种曾经从人们眼前消失的动物，又重新露面。害羞的霍加狓类似于斑马和长颈鹿的杂交产物，1901年首次有人在刚果看到它。后来这种动物越来越罕见，从1959年开始的随后几十年，野外雷达追踪器失去了它的线索，因此人们担心它可能已经灭绝。然而，5年前世界野生生物基金会的研究人员在野外（非洲刚果）又发现霍加狓的足迹。

霍加狓One third of 'extinct' animals back from the dead: Study

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.

After repeated rare sightings, it vanished from the wildlife radar for decades from 1959, prompting fears that it had died out.

Other mammals believed to have become extinct and later rediscovered include the rat-like Cuban solenodon, the Christmas Island shrew, the Vanikoro flying fox of the Solomon Islands, the Australian central rock rat, and the Talaud flying fox of Indonesia.

"We identified 187 mammal species that have been missing since 1500,"The Daily Mail Proceedings of the Royal Society B.

Though the new report has not played down the threat from deforestation, over-fishing or habitat destruction, it has raised questions about the way species are classified as extinct.