I read here on BYC that Black Oil Sunflower Seed is good for chickens, but my local grocery store only offered a mixed birdseed- lots of BOSS but also millet and a few other of the usual things birdseed has. The girls seem to love it but I suddenly wondered if it's OK. Also I know not to give them "too much" treats, but how much is too much? Can I give them a helping of seed every day? (By helping - I fill an old mealworm jar about a third of the way up, and scatter that around. It takes the five of them 5 minutes at most to consume most of it, then they wander off and the squirrels eat the rest.