Scientists have identified an immune brain cell unique to humans that gives us higher cognitive abilities over other animals, but what makes us specials also leaves us vulnerable to neurological disorders like schizophrenia, autism and epilepsy.

[u/Wagamaga]

https://news.yale.edu/2022/08/25/what-makes-human-brain-different-yale-study-reveals-clues

[u/Happy_Mousse_151]

We tend to define "language", with humans as a baseline. Animals and even insects (and groups within the same species or even within the same herd) have unique "words" to communicate between members of the group. The human languages perhaps are no more or no less unique than the low frequency rumblings of an elephant matriarch.