It doesn't take long for a chicken owner to figure out that chickens are really drawn to the color red. My very first order of chicks had me rushing to the hardware store for a red light bulb when one poor little chick got pecked on hard enough to bleed and all the others went at that spot with a vengeance! Scared me! I had to isolate the poor little thing while I went online to figure out what to do. I would also avoid green since they are also drawn to that color.
I use purple, blue, yellow, and have even used pink without problems but it did make me nervous.
Use food coloring (since it's non-toxic) inside the vent. A little will last several days.
I use purple, blue, yellow, and have even used pink without problems but it did make me nervous.

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