All five species are listed as endangered or critically endangered by the World Conservation Union.
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The World Conservation Union ( www.iucn.org) is another good resource for finding out about endangered species and habitats.
Most recently he headed the World Conservation Union (IUCN), a global organisation with more than 1, 000 stakeholders including governments and NGOs.
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The warning comes in a report prepared by TRAFFIC, the wildlife trade monitoring programme of IUCN-The World Conservation Union and WWF, the global environment campaign.
But, according to the World Conservation Union (IUCN) just 1 percent of these vessels are big enough to substantially threaten global fisheries, with the "capacity to take around 60 percent of all the fish caught globally".
They are now also one of the most endangered: As of the end of this year, for the first time in history coral reefs have been included on the World Conservation Union's Red List of Threatened Species.
Dr Julia Baum, a marine ecologist at the Scripps Institution of Oceanography, US, and a member of the World Conservation Union (IUCN), said excessive fishing was putting many of the ocean's "most majestic predators" at risk of extinction.
Representatives of the International Council for Science, the International Social Science Council and the World Conservation Union may take part, without the right to vote in all meetings of the Council, of its committees and of working groups.
UNESCO: Detailview | United Nations Educational, Scientific and Cultural Organization
The International Union for Conservation of Nature (IUCN) helps the world find pragmatic solutions to our most pressing environment and development challenges.
As well, the International Union for Conservation of Nature ( IUCN ) has served as a world-wide biodiversity platform for its many hundreds government and non-government members since it was founded over 60 years ago.
The International Union for the Conservation of Nature has found that 32 percent of the world's amphibian species are threatened or extinct, including more than 200 alone in both Mexico and Colombia.
Decisions on inscription are made by the World Heritage Committee, upon the recommendation of the International Council on Monuments and Sites or the International Union for the Conservation of Nature, the two advisory bodies for cultural heritage and natural heritage respectively.
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