And from Virgil, unlike poor old Plutarch who is thoroughly pilloried in another thread, the onomatoepaic:

"Quadrupedante putrem sonitu quatit ungula campum"

"The beautiful horse galloped across the plain". If you speak the Latin aloud, you get a rythym not unlike a dactyl ...

Quadrupedante putrem sonitu quatit ungula campum

Sounds just like the rythym of a galloping horse!