I have one black hen with one chick which is about a month now but they have drifted apart now (they are not very close anymore) and recently my other golden hen has 4 chicks which hatched a week ago, but the black hen attacks the golden hen and bites/pinches the other chicks. all the time the black hen races after them to snatch away their food and bites all of them. she nearly strangled one of the chicks by the neck aswell. they just do not get along! the golden hen says nothing yet, the black hen is still being a bully. ive already separated them when they sleep but this is happening constantly during the day what shall i do, any advice?