Flickr user, Charles Peterson

"By the 1930s, conservation groups across North America teamed up to help save the trumpeter, of which only 69 were known to exist. Various projects restored and increased breeding, wintering and wetland habitat, including the new Red Rock Lakes National Wildlife Refuge in southwest Montana. Trumpeter populations rebounded and reached almost 35,000 swans by 2005.

Roger Wollstadt

"By the 1880s, bison numbers had dropped from millions to scant hundreds. Few people in the densely populated East viewed the coming extinction of the bison as an ecological and cultural loss. Naturalist William Temple Horaday was one of the first people to call for the conservation of bison, along with his friend, Theodore Roosevelt. Hornaday, chief taxidermist at the Smithsonian Institute, was outraged that the slaughter of bison was allowed to occur.


Mar 14, 2014

3/15/14: This week on "The Plant Detective:" Hoodia, native to the Kalahari Desert of Southern Africa, works as an appetite suppressant by telling the brain that the stomach is full without affecting the rest of the body's functioning. After a long legal battle, the San bushmen of the Kalahari won a settlement for traditional claims to the knowledge of the plant.