A pack of adult sabertooth cats could attack and kill a huge bison in minutes. The cat's most formidable feature was its terrifying saber-like teeth - a pair of curving, seventeen centimetre long upper teeth with serrated inner edges like steak knives. They were as long and as sharp as the teeth of Tyrannosaurus Rex! The sabertooth has intrigued scientists for more than a century. Here is its story in vivid detail - what the sabertooth looked and sounded like, how it used its deadly jaws and teeth - and what may have caused their extinction!