Are there extinct species that we really wish we hadn't wiped out? I don't mean we now say, "Gee, what a shame." I mean, is there anything where we now say, "Oh $#!&, we screwed ourselves!"? Like when ...

Humans have spent centuries shaping the world. But nature wouldn’t hesitate to take over if we suddenly disappeared. Cities would crumble, and forests would spread. And certain species would rise to ...