Oh, and anyone who has both a child and a house pet has surely noticed that the child, exposed to speech, will acquire a human language, whereas the house pet won't, presumably because of some innate different between them.
Y cualquiera que tenga un hijo y una mascota seguramente ha notado que el niño, expuesto al habla, adquiere una lengua humana pero la mascota no, presuntamente por una diferencia innata.