"The rapid loss of species we are seeing today is estimated by experts to be between 1,000 and 10,000 times higher than the natural extinction rate," according to WWF Global.
These facts are bleak -- but there has been some success in recovering threatened species.
27 animals spent time on the endangered species list and were nearly lost to extinction, according to the US Fish and Wildlife Service. But thanks to efforts by conservationists, they have been recovered.
Click through the slide show below to see some of the now-thriving animals: