What is the white stuff on top of chicken poop?

Hi, my chicken ( Light sussex) has been having runny poo lately. White, yellow and greyish in colour. But this morning, I went out and there was black runny poo with like a tiny solid bit in the middle. it was Really gross! It reminded me of runny tarmac...

my little chihuahua got into the trash and ate chicken bones on tuesday night. its is know friday and he is puking up yellow stuff with little bits of chicken bones. idk what to do. their is not blood in his poop and he hasn't thrown up blood yet. but...

Ok so we have 2 indian runner mixed ducks (male and female) and some just regular old white hens. I went out to get eggs today and i noticed some orangish reddish poop. I know this isnt normal unless theyve been eating a variety of things like fruit...

So for the past couple of months I've noticed white fluffy stuff around my poop. At first it just started out as white stringy stuff and now it's fluffy kinda fuzzy looking stuff. Tonight I went poop and some of it was almost black with more white fluffy...