Forget drugs and gun-running. Organized crime has found a lucrative new way to make billions of dollars in the illegal trafficking of animal parts. As the journal Oryx reports, a powerful network of international crime syndicates is whacking thousands of endangered animals, some of which are facing extinction as a result. Though conservationists are sounding alarms, law-enforcement officials are hamstrung in their efforts to prevent ruthless, Mafia-style poachers from slaughtering animals on a scale never before seen. Four key questions:

What kinds of animals are being killed?

Creatures great and small. Elephants, tigers, and antelopes are being killed by the thousands every year. More than 330 rhinos were killed in South Africa alone during 2010, nearly one a day. "At this rate, they will soon be wiped out," says anti-poaching activist Kevin Bewick, as quoted by Discovery News. A menagerie of smaller, lesser-known animals are also threatened. Illegal smuggling is increasing the rarity of both the pangolin, an endearing anteater about the size of a house cat, and the loris, a little monkey weighing just three pounds.

Why are these wild animals so valuable?

Members of the burgeoning affluent class in China and other Asian countries are willing to spend billions each year on these animals, sometimes as exotic pets, but mostly for their body parts. Rhino horns and tiger skulls, for example, are believed to have aphrodisiac qualities or other "magical" properties. Bear paws, shark fins, loris feet, turtle shells, and other appendages all fetch a high price on the international black market.

How are criminals getting away with it?

Like drug smugglers and other organized criminals, those in the $10 billion-a-year business of wild animal smuggling use an array of tools to thwart law enforcement agencies. Cells phones, forged shipping documents, and e-commerce sites (the locations of which are difficult to track) are common among animal traders. Smugglers also use hidden compartments in shipping containers and rapidly changing routes to keep police at bay.

Is anything being done to stop the slaughter?

Yes, but law enforcement is struggling against near-impossible odds to fight poachers and smugglers. Manpower and money are the biggest problem, as police often find they're outmanned, outgunned, and outsmarted. Interpol, for example, has only one person in charge of wildlife crime enforcement. Corruption exacerbates the mess, says Asawin Suebsaeng at Mother Jones: "Many wildlife enforcement agencies in poor countries can be bribed out of effectiveness."

Sources: Discovery, Mother Jones, Science Daily