I've tried searching threads but usually over-mating involves male to female balance. I currently have 11 ducks with 1 drake and I maybe see him get with one once a day if ever. The problem lies with the 11 females. They are non-stop on each other every time they have swimming access to the point they have head/neck patches, sinus issues and occasional limping for the day. All are under 1 yr old ranging hatch between March and July of last year. I've read that this can be seen as practice and/or dominance. Is it normal to this extent or can I hopefully chalk this up to the young age and upcoming Spring?