Set your sights high!
Bird watching is a great hobby for children as it gets them involved in nature and inspire them. Bird watching is not so much the study of birds, as it is a social and recreational past-time. There is a significant auditory element to bird watching as birds are more often and easily identified by their calls than their markings.
Bird watching is a particularly good outdoor youth hobby as it not only allows for year round enjoyment of the activity, it actually benefits from the different season. As the seasons change, migration can bring many rare and unique birds through your area which can't be seen at any other time.
If you or your child is thinking about looking into bird watching you may also want to give these similar youth hobbies a look: Hiking, Orienteering and Camping. These other youth hobbies are either great alone, or combined in order to maximize your experience and enjoyment.