These poops are outside in a fenced pasture (with pond) where I only had poultry last year and we level three years ago with a bulldozer (and fence two years ago). They are around the door area so more concentrated but I didn't check if poops in other parts looked the same, but from what I saw it wasn't all only some of them. I wish I knew which birds they were from at least I could narrow it down more.
I wouldn't know what it is if it was seeds or whatnot. I didn't feed them anything other then the 'usual' - which consists of their mash diet and some wheat here and there but this isn't wheat. Treats usually consist of lettuce, bread or sometimes veggies but nothing I wouldn't recognize the seed of.