My 3 week old polish chicks have become crazy. They run around like I am trying to kill them every time I reach in to pick them up. They are handled daily. They are so terrified that I am afraid they are going to hurt themselves with this over reaction. They run in to the side of the brooder and chirp super load. Once in your hand they are fine and sit calmly and seem to enjoy the attention. I am just afraid they will have a heart attack or the stress will cause a problem. Any thoughts or ideas as to why they are acting like this or how I can break them of this habit?