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echidna, (family Tachyglossidae), any of four species of peculiar egg-laying mammals from Australia, Tasmania, and New Guinea that eat and breathe through a bald tubular beak protruding from a dome-shaped body covered in spines. Echidnas have beady eyes and mere slits for ears, and at the end of their beaks are two small nares (or nostrils) and a tiny mouth. Electroreceptors in the skin of the beak may sense electrical signals produced by the muscles...