dougieee
Songster
Araucana are rumpless....meaning they don't have a tail, not just the tail feathers, but the body part the the tail feathers would grow out of.
That's what I meant...can't find a pic showing the tail on a plucked bird.
Oh, here we go, this might help, showing removal of oil gland but tail is 'circled'.
View attachment 2040786
I do understand what you mean, your saying they actually have a rump its just featherless.
I still say at 6 weeks they should have at least some tail feathers and the absence points towards the hens genetics, i just dont think its possile to always predict how crossbreeding will come out.