Language can be used to refer to things real or imagined, past, present or future. When we listen to news broadcast, we know what has happened far and wide in the world. What can be spoken is not limited by time and space, while animals can merely communicate about what happens here and now. The cleverest dog cannot bark to tell others how badly its parents were treated by their owner. This feature of language is due to the fact that the human brain is specially structured for language and that the brains of other species are not comparable in terms of the capacities of memory and abstraction.