Okay so we are keeping our week old baby chicks in an old guinea pig cage that has plastic that comes up a few inches and a wire cage part that goes down into it. Today my brother went to go check on them and he saw a rat near the cage! Then I looked online and found that rats will kill baby chicks! Is that true? and can the rat get inside the cage somehow to get my chicks? I moved the cage to a new spot to get them away from the rat, but do I need to worry?