World Endangered Species Day
World Endangered Species Day is held on May 21. This environmental date is celebrated on the third Friday of May. This event in the third decade of the month May is annual. 
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Every year on the third Friday in May, thousands of people around the world participate in Endangered Species Day by celebrating, learning about, and taking action to protect threatened and endangered species. This global day of action and celebration was created and founded by David Robinson and the Endangered Species Coalition in 2006, and has continued ever since.
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and invasive species. The International Union for Conservation of Nature (IUCN) Red List lists the global conservation status of many species, and various other agencies assess the status of species within particular areas.
Similar holidays and events, festivals and interesting facts
National Rescue Dog Day in US on May 20
World Embroidery Day or International Vyshyvanka Day on May 20 (Celebrated on the third Thursday of May. Festival of culture of the East Slavic traditional embroidered shirt. Usually, an embroidered shirt was made from a homemade cloth, which was woven on a loom);
World Bee Day on May 20 (On this day Anton Janša, the pioneer of beekeeping, was born in 1734);
European Maritime Day on May 20 (European Council);
International Drunkard's Day on May 20
International HR Day on May 20
Volga River Day in Russia on May 20 (celebrated since 2008);
International Virtual Assistants Day on May 21 (the third Friday in May);
European Natura 2000 Day on May 21
World Tipping Day on May 21
Bike-to-Work Day in United States on May 21 (is celebrated on the third Friday of May);
World Goth Day on May 22 (The Official World Goth Day site defines it as "a day where the goth scene gets to celebrate its own being, and an opportunity to make its presence known to the rest of the world.");
World Interiors Day or Interior Designer Day on May 22 (Celebrated on the fourth Saturday in May);
Hagen Biodiversity Day on May 22