Rhinos

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

• By Marianne Messina

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

• By Alex Dudley

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.

• By Shreya Dasgupta

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?

• By Austin Merrill

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

• By Michael Todd

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

• By Lauren Kirchner

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

• By Kevin Charles Fleming