Lots of frogs around the world use a scream to scare off predators but scientists have found frogs in the Brazilian Atlantic Forest that can scream at an ultrasonic ... but no sound came out.
Ultrasonic proximity sensors emit and receive sound waves. The carrier signal is a high frequency, inaudible sound wave. They detect the presence of the target object in one of two configurations.
In a study led by Eduardo Mercado III and Jessica Zhuo, researchers observed that rats emit ultrasonic vocalizations ... Medical technology: Ultrasonic sound waves could be used to move or ...
Some plants emit a mournful melody using ultrasonic clicks when they become ... and a recording of 'the sound made by a dehydrated tomato' was played near one of the tomatoes.