Garlic affect chicken poop?

[CoastChick]

I started adding some garlic to my fermented feed (scratch and peck mash) and have noticed in the last 2 days the chickens all have really dark green-black poop? Is this normal? Some are normal with the urate cap and some are cecal looking - but the colors are definitely different.
In researching, I'm drawing a big fat ZERO... I have heard all over how garlic can help the odor of their waste but nothing regarding color.
Has anyone else run into this? Not really concerned - just curious.
All my girls (ages 23 and 21 weeks) just started laying in the last 2 weeks, so that is the only other new occurrence lately.

 

[Lady of McCamley]

I've given my chickens garlic and never had really dark green poop from it that I've noticed. It may be something else they ate.

Here's a chicken poop chart for comparison of what is "normal."

LofMc

https://the-chicken-chick.com/whats-scoop-on-chicken-poop-digestive/