Tuatara reptile slices food with 'steak-knife teeth'

http://www.bbc.co.uk/nature/18249270

Since the discovery of the Tuatara reptile, scientist have been puzzled at how the lizard has been adapting to the changing environments over the past 200 million years. Scientists have discovered that the lizard chews like a saw instead of the up and down like most other animals.

This is very cool, imagine chewing your steak like your sawing it up. Humans need to adapt this aspect.