Languages may even develop spontaneously in environments where people live or grow up together without a common language; for example, creole languages and spontaneously developed sign languages such as Nicaraguan Sign Language.
语言甚至可以在不使用同一种语言的人们聚居或共同成长的环境中自发产生；例如克里奥尔语，以及自发产生的手语如尼加拉瓜手语。