I mentioned a page about chicken poop, and went looking for it, to post. Turns out there are now multiple helpful pages about it, in fact! So, I'll post them here, to help you learn what is and isn't normal. 
(Edited to add the 2 best links)
1) http://chat.allotment-garden.org/index.php?topic=17568.0
2) http://www.fresheggsdaily.com/2016/03/all-about-chicken-poop-brown-black-and.html

(Edited to add the 2 best links)
1) http://chat.allotment-garden.org/index.php?topic=17568.0
2) http://www.fresheggsdaily.com/2016/03/all-about-chicken-poop-brown-black-and.html
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