I have two hens that I raised from chicks that are now about 18 weeks old. They are out foraging for large parts of the day. They have a good quality feed on hand at all times but just seem to pick at it (unless they are going at it when I am not watching). I give them healthy treats a couple of times a day, usually vegetable or fruit scraps and sunflower seeds. They go crazy for sunflower seeds, so much so that I wonder if they would eat nothing else but sunflower seeds if they had a choice! It has led me to wonder how much may be too much of a good thing. The seeds I am giving them so far are raw shelled and unsalted seeds that you find at health food stores or sometimes supermarkets. So, if they love these seeds so much, should I let them go at it or should I limit them as a treat? And what kind of sunflower seed is the best for them: black or other and shelled or unshelled??