Having roamed since the Ice Age, Saiga Antelope are no stranger to harsh conditions. But as mass mortality events leave their population extremely vulnerable, how have they managed to make countless comebacks?

After being extinct in England for centuries, beavers are making a comeback thanks to a new license permitting their wild release. How could their dam building prevent flooding and droughts?

As the world's largest surviving amphibian, Chinese giant salamanders haven't changed much in their 170 million years on earth. So what does life look like for these "living fossils"?