These kind of animals bats, whales and dolphins have echo sensors. They can be used to sense an object in the way. First they send out a high pitched sound then wait till it bounces back. If it doesn't come back then they know something is not coming. If it does come back they know something is in the way. This is Echolocation. This shows them how far away an object is, and where their food is.
Bat’s Hearing
Bat’s sends sounds out to an object such as insects. This sound reflects off the object and the echo goes to the bat’s sensitive ears. Bat’s can tell how far away its prey is and how far away the water is. They can hear your hair if it drops.
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