To extend this - your argument is that a human needs to be capable of communicating to have rights. This means that a human who is unable to communicate would logically lack rights. A child who was never taught to speak, or someone stuck in a land where no one speaks their language, or the victim of some horrific accident that deprived them of their ability to speak, would lack rights in such a scenario. If an organization was to breed human slave labor and never teach any of them how to speak or communicate, would any of those people have rights, since they're unable to petition for their rights?