Nuan Nuan, a female giant panda cub, is photographed at Malaysia's National Zoo in Kuala Lumpur on August 23, 2016. /CFP
A shiba inu is photographed in Shanghai on March 5, 2023. /CFP
An ostrich gives a cheeky wink in Kuala Lumpur, Malaysia, in this undated photo. /CFP
A chimpanzee gives an ear-to-ear smile in Chongqing on January 23, 2020. /CFP
May 8 is known as World Red Cross and Red Crescent Day, but it is also celebrated in some regions as the World Smile Day. Check out these animals' irresistible grins that are ready to make your day!