World Endangered Species Day
World Endangered Species Day is held on May 16. This environmental date is celebrated on the third Friday of May. This event in the second 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
International Conscientious Objectors Day on May 15
World Embroidery Day or International Vyshyvanka Day on May 15 (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);
Mucopolysaccharidosis Awareness Day on May 15
International Tuberous Sclerosis Awareness Day on May 15
Tree Day in India on May 15
Sea Monkey Day on May 16 (They’re known as Artemia New York Ocean Science and go through anhydrobiosis, or hibernation when they are dried out. Then, with the right mixture of water and nutrients they can spring right back into life);
International Virtual Assistants Day on May 16 (the third Friday in May);
International Day of Light on May 16 (initiated by UNESCO on November 14, 2017);
International Day of Living Together in Peace on May 16 (adopted by the UN on December 8, 2017);
International Coeliac Day on May 16
World Heavy Metal Day on May 16
International Boys Day on May 16
Bike-to-Work Day in United States on May 16 (is celebrated on the third Friday of May);
Love a Tree Day on May 16
World Dog Day on May 17 (started by The Vanderpump Dog Foundation in 2016. Celebrated on the third Saturday of May);
World Whisky Day on May 17 (Third Saturday of May);
International Day Against Homophobia, Transphobia and Biphobia on May 17
World Nordic Walking Day on May 17 (is a day of unified commemoration of the Nordic Walking Family around the world. It is for everyone, of all ages and abilities);
European Obesity Day on May 17 (Held on the third Saturday in May);
World Information Society Day on May 17 (International);
World Internet Day on May 17