I don't understand the distinction that you're making here...a lack of intergenerational transmission? Isn't all language at heart a personalized colloquial par

I don't understand the distinction that you're making here...a lack of intergenerational transmission? Isn't all language at heart a personalized colloquial parlance? The contemporary world of highly codified standard international languages is novel and weird. If the dolphins, in their signature whistles, invent arbitrary symbols that are assigned meanings in a social context, that's ultimately linguistic behavior that outmatches even the most precocious sign-language-using ape.