Birds. Of all the things you mentioned, it was the only one that jumped off the page. It tells something about you. It shows how you think. When they say they want to know how you will contribute to campus, don’t take it too literally. That doesn’t mean you have to take birds to school with you. It just means how you will contribute your unique individuality. Having a student who is passionate about birds IS a contribution to campus.
Sometimes it helps to know what others have written about. My son is a musician (but not majoring in it) and wrote about how he always has music going through his head. He described various situations and the movement of the classical piece that fit each situation and how that enhanced his life. Another student I know wrote about how much she loves puns and uses them every day. She gave examples of some of the very creative puns she thinks about. Both of these students are going/went to top schools, one of them HYP.