article_snippet: the size of a small car which roamed lakes and rivers in the time of the dinosaurs has been discovered in Portugal.
article_snippet: Scroll down for video .
article_snippet: It was as long as a small car and had hundreds of sharp teeth in a small car big flat head, which kind of looks like a toilet seat when the jaws snap shut.
article_snippet: Only a four square metre fraction of the site has been excavated so far, and work is continuing in the hope of unearthing more fossils.
article_snippet: Co-author Dr Richard Butler, from the University of Birmingham, said: 'Most modern amphibians are pretty tiny and harmless.
highlights_snippet: Killer amphibians- a relative to salamanders- were as big as a small car .
  