My 2 Partridge Chanteclers came from Ideal. For a while one had an up tail and the other sort of a "bob" with the tail feathers curving down over the rump. Then the other one's tail did the same thing. Definitely not the nice long, flat back through the tail look of the one's on John's page. Maybe it is just a "teen age" look? They are 15 weeks today.
Looks like it was an awkward "teen years" thing. Longer tail feathers growing back in at 21 1/2 weeks. Phew!
Bruce