Your oldest ancestor was really weird

... years ago may be the earliest-known animal in the lengthy evolutionary path that eventually led to humans. It was a weird-looking beastie with a bag-like body and, for its size, a really big mouth. University of Cambridge paleontologist Simon Conway ...

Why do birds have beaks and not teeth?

The 154 million-year-old limusaurus had tiny, sharp teeth as a hatchling that it gradually lost as it grew up, according to new research published in the journal Current Biology on Thursday. The finding is a first for the fossil record and may shed light on why birds have beaks and not teeth.