I've noticed at "bedtime" that our 4 barred rocks and 1 australorp will surround our 1 buff brahma. We also have 3 leghorns and 2 isa browns. The Isa's are about a year older than the others and we have had them since they were babies...we got the rest of them together and they were born in March. Is the buff brahma the queen and this is why they enclose her in the middle of them for sleeping? Any other reasons? Thanks!