Found in my 7 week old flock coop

[0fchicken89]

poop looks strange. Is this definitely an urgent health issue or what could it be ?

 

[TwoCrows]

It looks like Cecal poop to me. Cecal poop can come out in many shades of light to dark brown. It's usually pretty stinky too. As long as nobody is sick, all should be well.