no tail bone

[Amandalea]

My friend gave me some easter egger eggs to hatch from her flock. Only one hatched, and it has had issues with pasty butt, while cleaning it's but, I realized it has no tail bone at all. It just has a gap between its bones back there! I wonder if thats what is causing the pasty butt.

 

[Brandi Leigh]

I know that true Araucana chickens are rumpless but I don't think that would cause pasty butt.