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The world's second oldest profession? Tomb raiding. To combat the problem, American dealers and museums increasingly require a paper trail documenting a relic's ownership, but looters are just taking their business to Japan and Europe.

In archaeological sites throughout the world, antiquities are plundered for sale. U.S. agents says the looting is epidemic. One archaeologist working in Guatemala has launched a battle to save an ancient city from looters.

Snow leopards are among the world's most endangered big cats, with only several thousand left. In Mongolia's southern Gobi desert, the snow leopard is a sign of a healthy ecosytem. But poaching remains one of the area's more lucrative businesses.

Running underneath the rolling hills of Tennessee lies a still-mysterious and remote network of caverns. Many of those caves shelter fragile ecosystems, and biologist Jerry Lewis is helping to discover and protect some of those ecosystems from man's destruction.

The Leuser Ecosystem, one of the world's richest yet least-known forest systems, is increasingly threatened by logging and encroachment by a burgeoning population. We fly into the heart of the forest to profile the conservationists trying to keep it pristine for future generations.

Some scientists believe the orangutan -- a Malay word that translates to "man of the forest" -- may soon become extinct, wiped out by the humans it so closely resembles. We travel to the Indonesian island of Sumatra to profile competing plans to save the great ape.

In July of 1956, wilderness activists Olaus and Mardy Murie made an expedition to the upper Sheenjek River of Alaska's Brooks Range to inventory an untouched wilderness. Five decades later, one of their young disciples returns to find the beauty intact.

A promising conservation effort to save Nepal's endangered rhinos is now in serious trouble, due to poachers and fighting between government forces and Maoist insurgents. But a new truce is giving conservationists hope for the future.

Evidence suggests at least one group of insects, the tiny treehopper, communicates using sound vibrations. Researcher Rex Cocroft has scoured a biologically rich piece of the Amazon in eastern Ecuador to record the sounds of the tiny insect.

The jungle and rain forest surrounding the Tiputini Biodiversity Station is still incredibly wild, even by the standards of the Amazon. There are tantalizing hints that it also may be full of insects that talk to each other.