I saw my gander almost drown my runner duck yesterday. he's a Pilgrim goose about 8 mo old, he has a female. He's been bullying my runners for awhile (on land), but yesterday he grabbed a runner by the neck (in the water) then jumped on her back pinning her underwater. if I hadnt been there i think she would've drowned. Does that sound like he was trying to mate, or trying to kill her? Has anyone else had this problem keeping geese & ducks together?