Many duck-billed dinosaurs roamed the late Cretaceous,

Their appetite for tough old plants was really quite voracious!

Phytoliths are tough on teeth (not like rice and beans),

Lucky duck-bills' mouths contained real slice-and-grind machines!

The power of complex dentition gave them more food sources,

Strangely like much-later beasts, like elephants and horses!

http://www.sciencemag.org/content/338/6103/98.full