Happy feet: These two penguins smile for the camera while a panda looks content sitting in the snow
Pleased to meet you: This barbary macaque looks like it is having a ball at the Upper Rock Nature reserve on the island of Gilbraltar, while Otis the hippo gives the camera a toothy grin
A posing penguin, pictured with its youngster, looks rather pleased with itself and even a deadly Lemon Shark manages to flash a smile for the camera.
Got something to smile about? This shark smirks at the camera while a California tiger salamander grins from ear to ear