These birds are available in various color morphs, including grey, fawn, and white. However, their natural plumage colors are very attractive. Wild-type males are more colorful than females and ...

Scientists long after Darwin spent years trying to understand the process that had created so many types of finches that differed mainly in the size and shape of their beaks. Most recently ...

Few people have the tenacity of ecologists Peter and Rosemary Grant, willing to spend part of each year since 1973 in a tent on a tiny, barren volcanic island in the Galapagos. Even fewer would ...