This is a cut/paste job from https://chat.allotment-garden.org/index.php?topic=17568.0 but saw you gave them credit. You could find one for ducks to add to it and make this more of a resource, as many of us just go to the above link for chickens.
This is a useful guide to determining what is going on with a chicken's poop, and whether or not there is cause for concern. Thank you for sharing!
Good article with variety of photos to help determine normal vs abnormal. Thanks for taking time to collect and share!
