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The Brazilian Atlantic Rainforest is filled with the ear-piercing 'screams' of a tiny amphibian in distress, but until now, we humans have been oblivious to their cries. For the first time, researchers have recorded South American frogs crying out at a frequency that totally bypasses the human ear – but which would be quite unpleasant to animals with the right kind of receivers. The leaf litter frog (Haddadus binotatus) is the most abundant species of frog in the forest [...]