I have an indoor duck as a pet, and she's a lot of fun and very cute. But keep in mind that ducks are very messy! And, as others have said, keeping a single duck isn't advisable unless someone is going to be at home, in the room, with the duck pretty much all day. They're very social and get lonely easily. My boyfriend works from home and we have a tiny house so the duck watches him work and do things around the house during the day, but even so, I'm looking for another duck because I worry about her getting bored. So, I'd suggest getting at least two ducks. Even if your son can't get two ducklings from his experiment, now is the right time of year for farm supply stores to have them. At your son's age, he could probably do most of the basic duck maintenance, but it's a lot of work keeping the cage clean so he might need help sometimes. Ducks poop constantly!