Feline good: This mirthful moggy looks as if he's about to burst with laughter
Some-fin funny?: Even the littlest fish finds something to laugh about
Monkeying around: These orangutans look like they might fall out of the tree if they laugh any harder
A real hoot: They're not known for their sense of humour, but something must have tickled this owl
Twit-twoohoo: Another owl swaps twittering for tittering
Horsing around: Someone must have told him the one about the horse who walks into a pub and the barman asks 'Why the long face?'
Snorting with laughter: The joke was so funny this elephant had to sit down
Quacking good joke: This little duckling shows you're never too young to lark about
