Sometimes, I really get sick of humans. But seeing this reminds me that, despite our faults, we really are a great animal. What other animal goes out of its way to help other animals live the best possible life? Go humans!
Dogs. And cats (most cats lol). In addition to foxes, wolves, bears, lions, and many other animals when in the presence of animals they have grown up around and come to trust.
It`s a symbiosis mostly though. I mean the fungi bacteries etc. that you have mentioned. Also, cats dogs and so on help (MOSTLY AGAIN :D) to the other dogs and cats.
But of course there are cases when a dog bitch has raised little tigers, which although has happened thanks to humans.