Replying...
Intro. This is a world where prehistory is different, today's animals exist in prehistory, all possible animals, they talk more only among themselves, something that seems to roar grunted etc, for humans, for them it is a normal dialogue. but humans do not change they are still nomadic hunter-gatherers, living in small groups, using stone tools or developing agriculture and sedentary lifestyle, wearing animal skins and using fire for heating, knowing how to speak and the meteor that killed everyone never arrived. Normal animals ? Or animals from prehistory?

Prehistory

@Josh