A study has found that minority languages in the most developed parts of the world, including North America, Europe and Australia, are most at threat. A study shows that the more successful a country is economically, the more rapidly minority tongues are lost, as one national language comes to dominate educational and political systems. The team also found that languages in the Himalayas could be at risk, such as Bahing in Nepal, which has less than 10 speakers. And some found in the tropics are also disappearing. Rapid economic growth in these regions is thought to be driving this loss. The scientists say that greater protection is needed.