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From NBC5.com:

Mice Apparently Sing For Their Sweeties

ST. LOUIS -- Male mice apparently serenade their sweeties.

Researchers have known for decades that mice make high-frequency sounds undetectable to human ears. But the new research has found the squeaks are more complex and interesting than previously thought.

Researchers at Washington University in St. Louis said the males presumably use the tunes for courtship. One researcher says the sounds seem "a lot like bird songs."

Researchers have provided recordings altered to make the mice audible to human ears.

If the analysis is confirmed, mice will join the short list of animals that sing in the presence of the opposite sex. The other animals include songbirds, humpback whales, porpoises, insects and, possibly, bats.

The findings appear online in the journal Public Library of Science Biology.