When we are ringing it is not too unusual to find a bird (adult) with a tail that appears to have been replaced completely suggesting it had lost it's tail.
Most, maybe all, of the species we see moult their tail feathers sequentially, so the new feathers grow in at different times. Some birds show barring - marks caused by transient nutrient deficiency - right across all tail feathers (commonly seen in juveniles) suggesting they have grown all their tail feathers at the same time.
Many individuals lose a tail, partially or completely, and regrow it without futher mishap.
Mike.