Newly described fossils from South America are rewriting the story of giant snakes, revealing that anacondas have been enormous for at least 12 million years and never went through a downsizing phase.

Long before modern great whites prowled the seas, a colossal shark cruised the warm shallows off northern Australia. Its story begins on a rocky shoreline near Darwin, where a few heavy disks of ...

Snakes come in all sizes today, from tiny thread snakes no longer than a pencil to green anacondas that rival small cars in length. You already know the anaconda as one of nature’s heavyweights.