1. California condor (Gymnogyps californianus): The California condor is a large vulture found in North America. It was once widespread in the western United States and Mexico, but its population declined dramatically in the 20th century due to hunting, habitat loss, and poisoning. By the early 1980s, there were only 27 individuals left in the wild. Thanks to a successful captive breeding and release program, the California condor population has since rebounded to over 500 individuals, and it is now considered endangered but no longer critically endangered.
2. American bison (Bison bison): The American bison, also known as the buffalo, is a large mammal native to North America. It once roamed the continent in vast herds, numbering in the tens of millions. However, the bison population was decimated by commercial hunting in the 19th century, and by the late 1800s, only about 1,000 individuals remained. Through conservation efforts and the establishment of bison reserves, the American bison population has made a remarkable recovery, and there are now an estimated 500,000 bison in North America.