Instead of hunting visually the graboids find their food by sound; they are also able to sense ultrasonic signals as demonstrated in the third Tremors movie.

He activated a weak sonar transponder, worrying that the ultrasonic signal might draw sharks.

A backup sensor transmits an ultrasonic signal from its mounting position on the back of a car.

When the car is shifted into reverse, sensors transmit ultrasonic signals, then detect the echo of a signal that bounces off an object.

Females contact male polka-dot wasp moths by means of ultrasonic signals.

These splicers use an ultrasonic signal to melt the film together.

They could possibly be tracked via attached cameras or ultrasonic signals.

He received the Carl R. Ruddell scholarship award for research in medical ultrasonic signal and image processing.

The reproduction of these moths begins with ultrasonic signals sent out by the males in order to attract their female partners.

Females are attracted to these ultrasonic signals in any one of three ways; peak amplitude, signal rate, and the asynchrony interval.