Weirdest poop ever

[BI chicken mom]

This poop came from an eight week old meat bird. I heard it then saw the bird trot way with no sign of distress. Never seen any thing like this in person or online. Any ideas would be appreciated. Thanks

 

[nuthatched]

What's their diet?

 

[BI chicken mom]

Grower feed and greens/weeds we collect around the property. The are on dry grass in a mobile coop that is moved daily to clean areas.