Ive had a menagarie of pets over my lifetime and it seems there is always an "off-limits" food. Is there anything that is off limits to the chicks? I usually have leftover greens, kale, collards, parsely, carrots, from the lizard, the kids always have scrap fruits, apple cores, strawberries, grapes (which I know are ok) and stuff from us like broccoli or something.. is there ANYTHING tht is absolutely off limits? that would harm or poison them? TIA