There are about 1.300 species of bat and they largely differ in their hunting and eating habits. More than 450 species use echolocation while foraging for food. While some produce sound by contracting their voice box, others use their tongue and nostrils. The sound bouncing off objects in their way, producing an echo, helps the mammals navigate their way through the night. They can vocalise a low-pitch (10 kHz) to a high-pitch call (up to 200 kHz), which is often outside the human range of hearing. Bats also use their sense of sight to hunt, depending on the circumstances. Visual acuity may vary among bats, but they are not at all blind.
In fact, bats can see three times better than humans. Since our understanding of their sense of hearing for navigation is too well documented, their power of sight is often taken for granted. Most fruit bats, which feed on nectar, don’t echolocate at all. They have a sharp vision that exceeds the visual spectrum of humans. They can even distinguish colours.
Picture Credit : Google