Sure you could argue it's the opposable thumbs or variety of humorously named sexual positions we've invented, but you'd be wrong. We're the only one working hard at making ourselves obsolete. Which, I should note, is different from extinct. I'm looking at you, lemmings. Kidding, lemmings don't blindly jump off cliffs like you think. That's just an old wives' tale. The one about me being the world's greatest lover is not.
Thanks to Nathan, who's working hard at staying relevant. Well you've already got Tila Tequila beat.