Just like human hair, dogs' fur can go gray if they're going through tough times, a new study finds. Young dogs whose owners rated them as anxious and impulsive were more likely to have prematurely gray muzzles than dogs that were not regarded as anxious or impulsive, the researchers found.
Poison-resistant mice have been giving homeowners throughout Germany and Spain increased trouble in recent years. New research indicates that some of these mutant mice developed their immunity in a surprising way: by stealing it from another species. Poison resistance usually evolves as a result of changes to one letter, or
Microscopic parasites only a few cells large are essentially greatly degenerated jellyfish, a finding that could expand the definition of the animal kingdom, researchers say. "When people think of an animal, they think of a macroscopic, multicellular, complex organism, and now they'll have to expand their definition of an animal
The animal kingdom is full of strange reproductive strategies, but when it comes to menopause, humans are among the weirdest. In just three species on the planet — humans, killer whales and pilot whales — do females routinely stop breeding years before the end of their lives. Human women spend
This Behind the Scenes article was provided to LiveScience in partnership with the National Science Foundation. Natural selection argues for small biological changes that yield greater chances of survival and successful reproduction. Yet, that process does not square well with the evolution of social insects, particularly when their colonies can