Dana Kobilinsky

Birds leave diseases behind on migration

People are often required to get vaccinations against deadly diseases when they make trips to tropical areas, but birds don’t have that sort of luxury, even though these world travelers face similar risks. “They’re moving

Julia John

Ravens turn evolution on its head

Two lineages of the common raven (Corvus corax) in western North America have been fusing for thousands of years, researchers found, in what they say is one of the first and broadest instances of “speciation