Reconstruction of the giant filter feeder, scooping up a plankton cloud. Aegirocassis benmoulae was one of the biggest arthropods that ever lived. Family members include today's insects, spiders and lobsters. Marianne Collins/ArtofFact hide caption

toggle caption Marianne Collins/ArtofFact

Science

Think Man-Sized Swimming Centipede — And Be Glad It's A Fossil

This sea monster swam Earth's seas about 480 million years ago and was the biggest creature of its day, scientists say.

Listen Loading… 2:06
  • Playlist
  • Download
  • Embed
    <iframe src="http://www.npr.org/player/embed/392359786/392375512" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

Sternman Scott Beede returns an undersized lobster while checking traps in Mount Desert, Maine. Robert F Bukaty/AP hide caption

toggle caption Robert F Bukaty/AP

NPR thanks our sponsors

Become an NPR sponsor