Ultrasonic sound makes waves that vibrate so quickly that only animals with especially sensitive ... rats are calling for their mother using very high-pitched squeaks. This means they can ...

Eric Bgin on FlickrThe animal kingdom is a cacophony of grunts, growls, whistles, squeaks, and other noises that sound utterly crazy to the human ear but are essential to animals survival. We know ...

Once again, grade I murmurs may not be audible to some; however, grade IV murmurs are audible very easily ... Remember: High-pitched sounds are heard with the diaphragm of the stethoscope ...