Musical Mouse

This was also reported on CNN. Maybe by the same researchers?:

"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....these vocalizations were not random twitterings but songs.

If the analysis by the researchers is confirmed, mice can be added to the short list of creatures that sing in the presence of the opposite sex, including songbirds, humpback whales, porpoises, insects and, possibly, bats.

The finding opens the possibility of using mice to study and develop treatments for autism and other communication disorders....Bird song, how it is perceived and learned, is used to understand how the human brain works. But some questions might be posed better with mice....This raises the question about how their sounds develop and whether mice - like birds - are able to learn new sounds"

"Mice sing mating song," CNN.com, Thursday, Nov. 3, 2005.
http://www.cnn.com/2005/TECH/science/11/01/singing.mice.ap/index.html
 
Singing Icebergs???

"Scientists monitoring earth movements in Antarctica believe they have found a singing iceberg. Sound waves from the iceberg had a frequency of around 0.5 hertz, too low to be heard by humans, but by playing them at higher speed the iceberg sounded like a swarm of bees or an orchestra warming up....Once the iceberg stuck fast on the seabed it was like a rock in a river. The water pushes through its crevasses and tunnels at high pressure and the iceberg starts singing."
http://www.cnn.com/2005/TECH/science/11/24/iceberg.sings.reut/index.html
 
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