Rhinos

Nepal has had remarkable success at tackling the poaching of its greater one-horned rhinos but, since 2015, it has witnessed a sharp increase in deaths from unknown or natural causes.

New technology detects the shockwave of a supersonic bullet traveling through space, which cannot be muffled, to track poachers shooting at elephants and rhinos.

Nepal's successful anti-poaching measures are a model for other countries, while African rhino-range countries excel at marketing wildlife tourism.

In 2005, conservationists launched a plan to establish rhino populations in seven parks in Assam state. It proved to be an even bigger challenge than expected.

As poaching pushes the rhino toward extinction, South Africa considers a radical solution: Legalize the very thing that is killing them. It'd make some people very rich. But would it doom the species?

Restoring Africa's peace could be helped by restoring its fabled—and endangered—fauna.

South Africa debates legalization of the rhino-horn trade to stem smuggling.

Black-market rhino horns are more valuable than gold or cocaine. Could legalized "horn farming" save the endangered species?