Looking ourselves in the mirror: how unique is human language?

In our quest to define our own identity as humans, we have continued to stubbornly highlight those features that enable us to stand out from the rest of species; however, that is not an easy task to accomplish. If we just consider that technology is the characteristic quality of human beings, we are inadvertently excluding the native indigenous tribes of the Amazon rainforest due to the abysmal gap between them and the technologically developed nations. Even though the exclusion would satisfy those corporations which are mainly responsible for the deforestation of the Amazon, our curiosity should lead us to find better ways to answer what makes us humans. Obviously, we all would agree that language is a key characteristic, but is it a distinctive human feature?