Ameraucanas or any heavily under-downed breed will accumulate dried poop on the down under the vent. We had to wash our Blue Wheaten Ameraucana so often that it is one of the reasons I won't get another. It took an hour or more carefully getting all the dirt, poop, pebbles, debris, carefully washing it off with 4 to 6 baby shampoo applications and then taking forever to blow-dry all that fluffy underdown!!! There are other reasons also that we will not get more Ameraucanas (or EEs) but washing those fluffy tushes is a REAL chore and takes patience to get it all off gently. I thought the poor thing had worms or cocci or something but it was only that everything sticks to those very soft feathers! As fluffy as my bantam Silkies are I never had to take an hour or more to get their tush-down clean and blow-dried because they aren't as heavily under-downed as the large fowl fluffies.