article_snippet.sent: At one stage the worldwide population dropped to just a few thousand due to over-fishing and hunting, but a successful conservation programme has now recovered to 90,000.
article_snippet.sent: It follows a conservation 'success story' that raised numbers to 90,000 .
article_snippet.sent: All of the qualifying parameters for recovery have been met, including the population doubling in 20 years and growth of at least 60 per cent of the pre-exploitation abundance.
highlights_snippet.sent: two 'threatened' and two still 'endangered'
  Follows conservation 'success story' that raised numbers to 90,000 .