Researchers say the ancestors of modern frogs had thousands of teeth - and fangs

Canadian researchers say they've found evidence that the ancient ancestors of modern-day frogs were once keen predators with thousands of teeth to help devour their prey.

The team from the University of Toronto examined fossils of animals believed to have evolved into the amphibians people are familiar with today.

The fossils, believed to be 289 million years old, show that frogs, salamanders and other amphibians have evolved significantly over time.

While modern frogs have several small teeth lining the edges of their mouths, their predecessors' jaws were much more menacing.

The ancient ancestors, known as dissorophoids, boasted thousands of tiny hooked teeth throughout the roof of their mouths, as well as large fangs meant to sink into their prey.

Senior researcher Robert Reisz says the findings raise intriguing questions about the way the species has evolved over the millennia.