(CNN) - A new study says mice might be able to vocalize like people or song birds.
U.S. researchers say male mice may be able to learn songs based on the sounds they hear.
The males already make ultrasonic vocalizations for courtship, but it's been thought they lack the forebrain system to modify those sounds. But the scientists say when they're housed together the mice match each other's pitches.
Still, some in the science world are skeptical, saying the evidence just isn't there.
The study is published in the latest edition of PLOS One, a peer-review journal.