Ok so this has happened for about a month now. I have a boy pekin and a girl pekin and they are 5 months old. I put them in my kiddie pool and my guy duck gets on my girl ducks back and starts like pushing her head under water and biting the back of her neck. I do break it up because I don't want my little girl to drown! But if this is normal then I will let them be and let the boy have his way. Sorry this sounds like a stupid question but I am just concerned and this is my first time having ducks. Thanks for the Help.