Today, I introduced a new pair of breeding runners to my flock of ducks (bonded pairs of Ancona, Campbells, and Pekins) and the male runner started biting the fronts of the necks of all the females. Not the back of the neck like they were mating, but as if they were fighting. But he didn't do it to any of the males. To me it seemed like he was staking his claim to the females but I would have expected the other males to be upset. Thoughts?