My parents have been feeding the crows in their yard and they don't even have chickens! What they have discovered is this...don't put the food in any kind of container as they are very suspicious. Don't go through any big effort to make something special (more suspicion). They found that they could lay out whatever scraps they had (like a chicken carcas) and it would be gone in no time. They didn't want sunflower seeds. Remember, crows are scavengers but they are very clever. I'd give nuts, your meat scraps, dinner's leftovers, etc. BECAREFUL! This could also lure in possums which also like a chicken dinner. My Dad snapped a pic of a possum eating out of his bird feeder! Was none too little either!