My 5 month old male indian runner started chasing my 6 month old female mallard around their pen about a week ago. I assume he is trying to mate with her since he tries to grab her by the neck. She doesn't like it at all and runs away from him and she flies up on top of the duck house to avoid him. Whenever my indian runner sees me he instantly stops chasing her. I have to stand in the enclosure just so my mallard can get food, water and a quick swim. Whenever I leave he goes after her again. I'm surprised that he hasn't been doing this with my 5 month old female khaki campbell who I raised with him since he never lets her out of his sight. Anyways, is he just trying to mate and she doesn't like it at all? I feel bad for her since she sits on the roof of the house all day. Shes also considerably smaller since shes a female mallard and hes a male indian runner, I don't want her to get hurt. Is this normal and will he stop chasing her sometime?