PIC BY VERONICA CRAFT / CATERS NEWS
The pictures, captured by a host of photographers around the world, prove that all creatures great and small can give us a cheeky grin.
PIC BY MARK COWAN / CATERS NEWS
A caiman along the Los Amigos river with butterflies fluttering above its head.
Pic by Lincoln G Harris/Caters News
A Zebra appears to Photobomb his friends by pulling a silly face.
STEFAN MEYERS / ARDEA / CATERS NEWS
But it's not just land animals who have caught the laughter bug, as plenty of creatures who live in the sea have also been captured having a giggle.A smiling crocodile enjoying by himself in the Sun, Chobe River, Botswana.
PIC BY KENNENTH MACWILLIAMS / CATERS NEWS
Even those with a fear of sharks won't be able to help themselves from having a smile at the lemon shark who was pictured with a grin plastered across his jaws.
Pic by David J Slater/ Caters News
This mischievous-looking macaque snapped a selfie of herself while posing in Indonesia. Nauroto the black crested macque.
PIC BY MOGENS TROLLE / CATERS NEWS
The cheetah cub having a good laugh at the Serengeti National Park in Tanzania.
PIC FROM KERRYN PARKINSON/ NORFANZ FOUNDING PARTIES/ CATERS NEWS
But nothing can convince this blobfish, branded one of the 'ugliest' creatures in the world, to crack a smile.