We think one of our chickens is bi. She's an 8 month old Australorp named Inky. She's been humping another 8 month old chicken, bites her neck and acts like a rooster. The other hen just shrugs it off and walks away. Also Inky quit laying eggs a couple of months ago. She's always been a calm bird and likes to keep to herself, but does socialize with the flock. She doesn't fight other birds and doesn't seem to be dominant. Some of the other birds do push her away when I bring treats. I've asked this question before and no one has heard of a hen doing this. I can't believe she is the only chick that does this, anyone have any ideas?