Not quite as great as the news that rats laugh, but then what is?
The Guardian reports that scientists have discovered that male mice are melodic:
Research by a team of neuroscientists has revealed that male mice construct complex songs and sing them for minutes at a time when they come across sex pheromones produced by potential mates. The songs are not audible to the human ear because they are too high frequency and although scientists knew mice emitted ultrasonic chirps, recordings of the noises had never been fully analysed.
You also listen to the mice singing. The story about rats laughing when tickled is accessible via the BBC site.
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