International Animal Rights Day
International Animal Rights Day is held on December 10. This event in the first decade of the month December is annual. 
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The Universal Declaration on Animal Welfare (UDAW) is a proposed inter-governmental agreement to recognise that animals are sentient, to prevent cruelty and reduce suffering, and to promote standards on the welfare of animals such as farm animals, companion animals, animals in scientific research, draught animals, wildlife and animals in recreation.
Source: en.wikipedia.org
Similar holidays and events, festivals and interesting facts
National Tree Planting Day in Malawi on December 9 (Date for 2024; celebrated on the second Monday in December);
International Day of Action for the adoption of the Declaration of Animal Rights on December 10
International Monkey Day on December 14 (The unofficial international holiday was created by artists Casey Gore and Eric Millikin to spread knowledge about animals and to show them care and love);
National Energy Conservation Day in India on December 14 (since 1991);
World Energy Conservation Day on December 14
United Nations Environment Organization Foundation Day on December 15
Look for an Evergreen Day on December 19