Parrots are well known for their ability to mimic human speech. One particular gray parrot named Alex was even able to identify and answer a wide range of questions about objects he had become familiar with.
Primary progressive aphasia is a rare nervous system syndrome that negatively affects the ability to speak and understand words.
British people spend a lot of time talking about the weather. In a recent poll, 94% of British people admitted to having a conversation about the weather in the previous six hours.
Famed linguist Noam Chomsky has argued that humans possess a biological "language module" that allows the expression of a potentially infinite number of utterances, thoughts, and ideas with a limited set of sounds.
Many philosophers and scientists in the 17th and 18th centuries believed that spoken language was the chief indicator of rationality. John Locke, hearing of a Brazilian parrot who could speak French, concluded that perhaps there were other rational animals besides us.