OK, you're right; not all of the animals below are actually laughing, but they sure do look like they're having a good time!
The chimpanzee on the left is testing out new material for his comedic stand-up routine.
Photo: David Woo/Flickr
This elephant is physically unable to contain his joy and excitement.
Photo: Tambako The Jaguar/Flickr
This chortling cheetah is reminiscing on an exceptionally hilarious memory involving a wildebeest and a guineafowl.
Someone call the vet! This otter is suffering from a serious giggling fit.
Photo: Fraser Mummery/Flickr
This zebra's hobbies include chuckling, guffawing and cracking up.
Photo: Shane Gorski/Flickr
This squirrel is tittering about that mustard stain on the front of your shirt.
This elephant seal just looked at himself in the mirror.
This cackling cat is actually laughing at his own joke.
Photo: Josh Dubya/Flickr
This dog just can't.
This seal is literally rolling on the floor laughing.