Has anyone heard of this... the lady at the feed store held a key tied to a string above the chick's head. She said if it's a female, the key will start circling. She also showed me this on her wrist. Another thing she did, which I think was cruel, she held the chick by it's head and said if it's a rooster it will fight. Please let me know if anyone knows of these tricks? My next question will be.... can you hold it over an egg to tell the difference so as to set only female eggs, lol. Just wondering, seriously.