The World Day For Animals In Laboratories (WDAIL); also known as World Lab Animal Day or World Day for Laboratory Animals, is observed every year on 24 April. The day was instituted in 1979 by the National Anti-Vivisection Society (NAVS), as an “international day of commemoration” for animals in laboratories.
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WDAIL aims to end the suffering of animals in laboratories around the world and promote their replacement with advanced scientific non-animal techniques. Apart from this, the “World Week for Animals In Laboratories” (Lab Animal Week) is celebrated from April 20 to 26.