No trace at all...

[DellaMyDarling]

I managed to lose a bantam chick.
Vanished from the run, the one time I let them out with the big chicks.
Especially weird to me, because the group sticks together like glue.

 

[Folly's place]

I lost bantam chicks who got through the dog crate wire door, poor little things were torn up by the hens, with mama locked in the crate. Awful!
Separate is best, until the babies are a week or so old, and mobile, and with mama to defend them.
Mary