We received an order of 30 chicks this morning from McMurray. One arrived dead. The rest looked fine until a couple hours ago we found one suddenly weak, laying down, not wanting to eat or drink. We removed it and put it under a separate light, but is continuing to get weaker and weaker. Now we have a second chick doing the same thing. In both of these cases it came on suddenly. We've always hatched our own chicks, these are the first we've had shipped (other than ducks). Could it be the shock from shipping? Any other ideas?