Hyenas are probably best known for their braying laugh but it seems like the whole of the animal kingdom shares a sense of humour, if these images are anything to go by.
A hilarious collection of pictures captured by photographers around the world suggests that everything from gorillas and raccoons to sharks and parrotfish enjoys a good joke.
Even the blobfish, which has been widely thought of as the world's most miserable looking creature, tries to crack a smile.
What's so funny? This raccoon looks like he has just heard the punchline of a joke. Maybe he is a bit of a raccoonteur.
If there is one animal you probably don't want to see smile it's a shark. The grin of this lemon shark reveals two rows of terrifying teeth. But there have only been a handful of attacks recorded on humans by lemon sharks.
Is it just me or does this chap look familiar? The creases on the face of this macaque, from the Huangshan Mountains in China, look distinctly like laughter lines.
Vietnamese pot-bellied pigs are not known as the cleanest of animals so this porker is bound to be chuckling at a dirty joke.
This seal at the Fisherman's Wharf in Monterey, California appears to be cracking up about something deeply amusing.
This fish looks like an extra from a Disney movie as it swims near Key West in Florida. But then living off the coast of Florida doesn't sound such a bad life, as long there are no sharks about.
What do you get a donkey with a fool? A big ass! This is a burro, a breed of wild donkey found in Spain and also, like this one, in the United States (pictured) and Latin America.
This creature has got to be Mother Nature's best gag. It is the theridion grallator, better known as the Hawaiian Happy Face Spider. Scientists can find no evolutionary reason for the bizarre patterns on the littler critter's abdomen.
Never play cards with a cheetah because they will always have the last laugh. This cheetah cub at the Serengeti National Park in Tanzania appears to be having a good giggle at our expense.
Otis the hippo is a good natured fellow. He lives in a large pool at San Diego Zoo, one of the world's best, and has fathered several calves with his partner, Funani. So it's no surprise that he is smiling.
That tickles! Kituba the baby gorilla is in fits of laughter as he plays with his mum, Lena, at Dublin Zoo.
This is the closest the blobfish ever comes to a smile. In 2013 the blobfish was voted the world's ugliest animal. Thankfully blobfish, which live in the sea off the coast of Australia, don't have ears...or feelings .
Always look on the bright side of life. That is definitely the case with this Sulawesi crested black macaque. They are one of the most endangered species in Indonesia .
This caracal seems to be smiling at the camera. Caracals are widespread in Africa and the Middle East and were revered by the Ancient Egyptians. They have also been bred in captivity.
This snowy owl is having a rare old time at the Olympic National Park in Washington state in the US.
Put those teeth away! This gurning horse is in a very good mood, possibly because the sun has just come out.
This baby zebra is game for a laugh. This image was snapped at the Busch Gardens safari park in Tampa, Florida.
This rabbit seems to be full of the joys of life. This image was captured by a photographer in the Netherlands where, like Britain, rabbits are a common sight.
From a smirking seal to a giggling gorilla, series of funny pictures prove it's not all beastly in the animal kingdom. This set of photographs shows a range of animals, from fish to zebras, breaking out their best smiles. Hyenas are best known for their laugh but it seems that they are not the only comedy creatures. One of the most bizarre images is of the Hawaiian happy face spider, so called because of a pattern on its back. Even the blobfish, considered the world's most miserable-looking creature, does its best to crack a smile. Wild smiles as the animal kingdom grins to greet the coming summer.
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