From Sylvester 017 - When there is a wide array of foliage for chickens to choose they will eat the correct plants. However if foliage is not varied or plentiful they WILL eat the bad stuff because it's the only available greenery. So it can be pertinent to know the toxics from the safe plants for pets.
AH, I see! Well, it is true that my girls have a huge variety of plant life to choose from. For vegetation they tend toward grasses and seeds (from grasses and plants that have gone to seed). For "free range protein" - just about any bug they can catch other than wooly bear caterpillars.
Just another example of why one person's flock will differ from another person's even though they are all chickens.