I've got a flock of 10. 9 of them came with me when I moved to city limits from an apple farm. On the farm they free ranged most days and grazed on grass all day long. Now that they are a backyard flock, grazing is very limited. I'm trying to get more greens into their diet but they're so picky! They hardly get excited about lettuce or spinach and I don't know what to do. Any suggestions?