Ducks on track trigger crash between Supercars champions at Bathurst

Ducks wandered onto the track during practice for the Bathurst 1000, so officials waved yellow flags.

Winterbottom slowed, but Courtney’s car hit the back of his Mustang.

Both cars were damaged and returned to the pits for repairs.

The incident shows why drivers must slow down for flags, even when hazards are hard to anticipate.