How do bats find food in the dark?

The image is a bit confusing, since fruit bats use sight, see the big eyes, and smell, to find their tropical fruit. Also, "sound" waves over 20 kilohertz, beyond human hearing tends to be called "ultrasound" or sonar. In the same way ultraviolet and infrared is used for light that our eyes can't perceive. Predatory bat, insectivores, piscivores use Sonar.