By comparison, the songs are longer and simpler when the males sing directly to the female in her presence found the study published in the Frontiers of Behavioral Neuroscience."We think this has something to do with the complex song being like a calling song, and then when he sees the female, he switches to a simpler song in order to save energy to chase and try to court her at the same time," said co-corresponding author Erich Jarvis from Duke University.

"It was surprising to me how much change occurs to these songs in different social contexts, when the songs are thought to be innate," Jarvis added.For more than 50 years, it has been known that mice sing. That is, they emit what's called 'ultrasonic vocalisations' or USVs, sounds so high-pitched that people can't hear them.

These vocalisations are known to occur in the wild when a mouse pup calls for its mother.And USVs grow more complex as mice reach adulthood. But researchers are still trying to decode the songs and determine how they vary across different social situations.

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