Huginn and Muninn are a pair of giant ravens controlled telepathically by Odin. They were created for him as a gift by Hekate. They are immortal and capable of human speech. They become trapped in a shadowrealm, where they will presumably remain until the end of time.
The ravens have no concept of boredom.
Ordinary ravens, similar to parrots, are capable of emulating human speech to some degree (example).