Stephanie O'Neill

Wildlife trafficking is one of the world's biggest illegal trades, and the U.S. creates much of the demand for pet primates. Now there's a proposed ban on privately owning and breeding these animals.

In northern California, a group of volunteers spend every night from late fall through winter as crossing guards–escorting migrating salamanders across a rural road.

A group of volunteers spends every night for a few months acting as crossing guards for tiny amphibians: migrating salamanders.

Only about 300 to 400 people a year give a kidney to someone they never met. It's an act of generosity so unusual, a neuroscientist studies the people who do this.

About 300 Americans a year give a kidney to a complete stranger. Research says these people have a larger amygdala -- perhaps making them feel others' pain more than the average person.

More than 90,000 people in the U.S. are waiting for a kidney transplant. But a kidney shortage means many die on the waitlist or become too sick for a transplant. A new plan would compensate donors.

Completing a routine depression screening questionnaire during an annual checkup is cost-free under federal law. But, as one woman discovered, answering a doctor's follow-up questions might not be.

Some doctors and medical practices voluntarily give rebates on a bill if an injury occurs during a procedure, while others will not, a medical ethicist says. Here's how patients can respond.

William Simpson wants to deploy the wild horses across public lands, to live and graze — and ultimately, prevent the worst wildfires.

When insurance firms wouldn't pay, a woman facing a large tab for her newborn's ICU treatment was given a chance to pay $45,843 a month for a year. The story changed when a reporter got on the line.