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Male Mice Sing When...

Male Mice Sing When Females Near

Scientists have known for decades that male lab mice produce high-frequency sounds - undetectable by human ears - when they pick up the scent of a female mouse. This high-pitched babble is presumably for courtship, although scientists are not certain. But it turns out those sounds are more complex and interesting than previously thought. "It soon became ... apparent that these vocalizations were not random twitterings but songs," said researcher Timothy Holy. "There was a pattern to them. They sounded a lot like bird songs."
Ref. https://news.yahoo.com/s/ap/20051102/ap_on_sc/singing_mice

When Sing Mice Male

Now that is interesting and a good means of courting, after all, what kind of gal would not be just a tad bit curious of some gent willing to serenade her? I also wonder if other animals like dogs and cats can pick up these sounds, hence their ability to find them easily?