Yes, this is most likely absolutely normal. Usually there is a somewhat frightful event that leads to shedding all of the tail feathers at once as this type of shed typically doesn't happen during a regular moult.
Essentially this is a defense mechanism (i.e a response to predators) as it allows a quick escape. Many members have had this experience with their budgies and often refer to their budgies as "duck butts" since their tails are so short.
My budgie Kiwi lost all his tail feathers once when we had brought him to a pet store to get his wings clipped. He escaped and was flying all over the store and the lady tried to grab him only she just got the tips of some of his tail feathers so he "released them" so he could get away...
Yes, both my Fluffikins and my Kiwi (lol) lost all tail feathers. Fluffy was in the cage with Mystery and Killer, last spring, and I think the three of them actually got into a nasty argument over Mystery. (She was in the process of bonding with Killer, and I'm the idiot that put 2 males and a female in the same cage.) Then when we got Kiwi, she was a duck butt within a day of being here.
It's kind of funny to see them without tail feathers, but as Goldielover said, they grow back quick and it's pretty normal.
Kiwi must be a very common name for a Budgie, lol.
What is a harlequin budgie? I have never heard that term?
Yes it is normal that her tail fell off and don't worry it will grow back. Gracie-Mae is also a Harlequin budgie. The Harlequin is a recessive pied budgie. This variation is also called the Danish Pied Budgie. The Recessive Pied Light Green has a buttercup yellow mask. Their bodies has patches of light green and yellow. They have a varying amount of black throat spots, and silvery or white cheek patches. I was told that Gracie-Mae also has a mix of Cinnamon in her. They are beautiful budgies and larger in size than the norm.
Yeah, a Harlequin budgie is just a breed - a yellow budgie with black and white marks, my Kiwii also has blue-green marks! Some other budgie breeds are...Universal Budgies - very expensive! Or fancy budgies - very cheap!