OR-7 has inspired activists worldwide. His 17 pups have moved across Southern Oregon and Northern California. Unwittingly, he has done more for his species than any other wolf.
The hunting of Sumatran tigers carries penalties of jail time and hefty fines.
There are about 100 Devils Hole pupfish left, according to the most recent counts.
An Obama-era policy had banned the importation of endangered animals.
Should we be saving the rhinos or the poachers driving them to extinction? The answer is not as easy as you might think.
With around 30 of its species surviving, the vaquita porpoise is the world's rarest marina mammal.
Activists say overfishing will have devastating consequences for the species.
There is no one definition of 'recovery,' allowing critics to argue the Endangered Species Act isn't working well enough.
Agriculture has made major impact on animals, birds, fish and plants in last 40 years.
In the Rio Grande Valley, the barrier erected to keep out illegal immigrants is imperiling rare and endangered animal species.