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New Delhi, A new study claims to have documented the “first” case of an ultrasonic ‘distress call’ made by a Brazilian frog species’ for self-defence. While humans would be incapable of hearing this scream, researchers said the distress call had an “ear-piercing intensity” for many animals, including predators of amphibians such as bats, rodents and small primates all of which can emit and hear sounds in the ultrasonic range. Unlock exclusive [...]