Animals can laugh and feel emotions, just like humans, scientists claim.
Dogs, chimps and rats have all shown emotions during experiments, where they appear to chase, tickle and show affection for each other, they said.
The American scientists first saw this in what they called "laughing rats", which responded to being tickled by humans and seemed to be giggling.
This theory goes against the common belief that animals can't feel humour or real emotion.
In the study, the rats quickly learnt to look for tickles from the scientists, and preferred to spend time with other "happy" rats which chirped, or laughed, a lot.
"Young rats have a marvellous sense of fun," one of the scientists said.
Chimps, dogs and other mammals were also seen to make sounds a bit like human laughter in funny situations, they said.
So next time it looks like your pet pooch or pussy is laughing at you - they probably are!
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