A You probably know that, every year, some plant and animal species disappear forever. (1) Experts think that 40% of the languages that exist at the moment are in danger of disappearing. And they estimate that one language disappears every two weeks! The cause of this is simple: parents in some communities don't speak their mother. tongue to their children. As a result, they never pick it up. This is happening all over the world. (2). In Australia, Tjupany is a language that has only ten native speakers.