Mouse Calls (AUDIO)
Caption
Because tiny California mice are usually making noises at a frequency too high for the human ear, this recording of their ultrasonic vocalizations has been slowed to 5 percent of its original speed. It begins with two types of affiliative calls -- the bird chirp of the simple sweep, and the whale-call-like sustained vocalization -- and ends with a monstrous and violent "bark" the researchers compare to an angry dog crossed with a lion's roar.
Credit
Recording courtesy Josh Pultorak
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License
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