While some of the more intelligent animals could be interesting to see just how far they could go, most animals are going to mostly be vocalizing for the purposes of procreation. The wonderful sounds of the forest are millions of bugs and animals screaming, “hey, wanna fuck?” as loud as possible. Other vocalizations will be similarly utilitarian like, “look out, predator”, “holy fuck this hurts” or “back off!” Not exactly stimulating conversation.