I got my chickens from someone who didn't know the sex, breed, or age of the chickens. From looking at them, I guessed they were between 8 and 12 weeks old. I'm no expert. Today when I let them out to free range, one of them was pulling anothers feathers and looked to be attempting to mate. I thought they were too young for this. Will they mate before the pullet is actually laying eggs, or is this just showing dominance?