Bats are the only mammals that can really fly. They are very mysterious animals, appearing only after twilight to hunt insects. Even with the best of eyes, these small insects are not visible in the dark. That is why bats have such good ears. To 'see', bats transmit signals which return as echos when they bounce against something, such as an insect. They receive these echos with their ears. This method is called echolocation.
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