As census methods in different countries vary to a considerable extent, and given that some countries do not record language in their censuses, any list of languages by native speakers, or total speakers, is effectively based on estimates.
Os métodos censais dos diferentes países diferen en grande medida, e moitos países non consideran as linguas nos seus censos, polo que calquera lista de linguas de falantes nativos, ou de total de falantes, está baseada en estimacións.