It's a question visitors ask staff all the time at the Smithsonian's National Zoo's Bird House. The answer may surprise you!

So far, the oldest-known bird fossil is the famous Archaeopteryx ... This odd, crow-sized creature had long legs and three toes tipped with claws; its jawbone and teeth were like those of a ...

This story appears in the April 2012 issue of National Geographic magazine. A flamingo looks like a bird cooked up by an exuberant preschooler—absurdly long legs, knobby ankles (that look like ...