yeah they don't.. but c'mon, you know as well as i do, it's meddling with other species that dissapear for good... the only species i know anything about that's dissapeared (i'm not too much into animals and shit) is the dodo bird, and that was becasue we hunted them all til extinction...

International Wolf Center
In the year 2000, scientists estimated that at least one species of plant or animal goes extinct every 20 minutes—that's 26,280 species that disappear every year!
just to give you an idea how many we lose every year...

and on a side note the only 2 species that i've ever heard we've meddled with that were endangered that we didn't end up wiping out completely is the panda and the bald eagle..