The white tree frog, which is native to Australia, Indonesia and New Guinea, "sunbathes" on a branch in Indonesia. /CFP
An inquisitive emu looks into a photographer's camera at Maru Koala and Animal Park, near Melbourne, Australia. /CFP
One-year-old giant panda cub Nuan Nuan reacts inside her enclosure during a birthday celebration in 2016 at the National Zoo in Kuala Lumpur, Malaysia. /CFP
A Siberian tiger "smiles" at visitors at the Hangzhou Zoo in east China's Zhejiang Province. /CFP
This gray seal pup nibbles on its flipper as it playfully stretches out after snoozing in the winter sun on the Lincolnshire coast in UK. /CFP
May 8 is World Smile Day, the only global festival that celebrates a human expression and was established by the World Mental Health Organization in 1948. Check out these smiling animals that will make you smile all day.
(All photos via CFP.)
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