Do animals can talk?

Practically all animals communicate each other to be recognized, hunt, be warned of dangers, show affection or enmity, but the language is more than that communication. 

According to Robin Dunbar language is uniquely human. Are some doubts about the dolphins, for example, but all other primates and terrestrial animals exhibit some forms of language in primitive forms, they are far from the complexity of the information exchanged between humans. It is possible to teach other animals to recognize and even imitate human speech. Dogs can learn 20 to 30 words and parrots play them, but no dog is able to speak voluntarily and parrots do not seem to distinguish between reproducing words and imitate other sounds. The process of voluntary speech is quite another thing.