A Breather: The Squirrel's Ultrasonic Warnings

In the midst of all this intensity, I thought you'd appreciate a change: a little wildlife news, hot off the press:

The squirrel's secret: ultrasonic warning calls

Squirrels have been recorded using high-pitched ultrasonic "whispers" that are inaudible to the human ear but warn each other of danger. It is the first time that any animal has been found to use ultrasound for an alarm call although high-frequency sounds well beyond the range of human hearing are widely used by bats. Read on