";s:4:"text";s:2788:" If you were to record a bat's echolocation chirps with a bat detector you would see that their chirps fall in the range of 12,000-100,000 Hz, which is pretty much beyond what humans can hear (humans usually hear between 20-20,000 Hz). Art. Theory developed from acoustics and sonar engineering permits a strong predictive basis for understanding echolocation performance. Even animals that eat other animals are dependant on plants because without them their plant-eating prey would not exist. The calls from the bat can reach up to 130 decibels which is recorded as the most intense of all airborne animals in the world. It has been studied at length by various researchers. Echoes are produced immediately when the sound waves hit an object. Most bats create echolocation sounds by contracting their larynx (voice box), though other species produce the echoes by clicking their tongues. The process of echolocation is very complex. Have students create Bat Mobiles or a Flying Bat Flip Book [archived copy]. It’s not hard to see why animals need plants – most animals eat plants and cannot live without them. If you have a large class, you might assign two small groups to each bat. This echo bounces off the object and goes back to the bats’ ears. Low-duty-cycle echolocation allows bats to estimate their distance from an object based on the difference between the time a sound is emitted and when the echo returns.
Bats are not blind, although some species can see less well than others.But flying around and hunting insects in the dark requires an extra sensing system – which they have. Most species of bats rely on echolocation to help them find prey. This is why it is no problem at all for them to be able to find prey in complete darkness. How do they do it? Investigating How Bats May Be Used as a Subject for Study in Science and Cross-Curricular Studies" by Paul Elliot, School Science Review, December 1995.