Muscovy duckling Vomiting???

[MvWyk]

Can anyone maybe tell me is it normal for a duckling to vomit or is there something seriously wrong with her? Yesterday and this morning some of the food and worms she ate came back up as it was in her cage where she sleeps.

 

[paws4440]

My ducks have vomited

 

[paws4440]

But that was when they just ate and I was picking them up in the car