Idaho State University researchers have built a computer model of a spiral-toothed fish dubbed Helicoprion, which lived 270 million years ago. Using CT scans, the researchers discovered that the creature's saw-like teeth were at the bottom of its jaw. "As the mouth closes, the teeth spin backwards ... so they slash through the meat that they are biting into," said researcher Leif Tapanila.

Full Story:

Related Summaries