A new study shows that the butterflies' antennae are key.
The 'war on drugs' has failed, some Latin American leaders say. But legalization of small amounts of marijuana, cocaine, and other narcotics may not curb violence.
New surveys find the recession has reduced Mexican immigration, but that millions still want to come to the US – and some more for safety than for jobs.
Many countries in the region – most recently Mexico – have decriminalized small amounts of drugs for personal use. The moves have followed decisions by left-leaning governments to limit cooperation with the US in recent years.
The deep US recession – and a rebound in Brazil – have reversed the flow of migration. Will other immigrants follow?
Scientists say the Greenland ice sheet is losing about 7 billion cubic feet of ice a year. Now, they are just finally beginning to uncover some reasons why its been shrinking.
Mexico City's Garibaldi Plaza, long the home of live mariachi music, will soon be home to a museum, restaurants, and an agave garden.
A study found that up to 30 percent of the geese now forgo migrating to warmer regions of the Pacific coast.
Secretary of State Hillary Clinton, Colombian President Álvaro Uribe, and Chilean President Michelle Bachelet will be among the speakers at a forum on the successful programs Tuesday in New York.
The cost for adding 600 miles of new barriers is $2.4 billion so far. The new fencing has been breached more than 3,000 times, a government report finds.