Blind Cavefish Provides Surprise Clue To Mammal Evolution

If you're trying to understand the earliest days of mammal evolution, including how our ancestors lived, the genome of a blind cavefish might not strike you as the most obvious place to hunt for clues. A study out today, however, suggests that's exactly where you can glimpse our distant — and very dark — past.
Animals that live exclusively in lightless caves often share a suite of traits, called troglomorphisms, which include loss of pigmentation and loss not only of vision but