Hi all! This is my first post and I'm also new to having hens all together. I purchased 3 hens on Wednesday - one fully grown and 2 about 4-5months old from a local woman who raised them in her yard. They have been doing really well and today I decided to add one more to the flock as I feel my coop has the space. So I went back to the same woman and got a hen that mine are familiar with and were in a flock with. When I brought her in, my largest hen immediately started biting her in the neck. Needless to say I separated them for the time being. I am wondering if it is normal for her to do this to establish dominance? The hen I got today is younger and is not fighting back at all - she just screams. Should I let them hash it out a little so they can figure out the pecking order? Or will the larger hen seriously injure the smaller one? They have been apart for less than one week. Any advice would be very helpful. Do I need to separate her more long term even though they should be familiar with each other? Thanks!