This depends on your definition of speech I guess. Many animals have vocal capabilities to create complex enough sounds that they could conceivably construct pe

This depends on your definition of speech I guess. Many animals have vocal capabilities to create complex enough sounds that they could conceivably construct perceptible human phonetics (not least parrots), but they don't do so naturally in the wild. They do however all communicate with each other in some form, much of it vocal; does that constitute "speech"?