Once trained for a certain level you can start learning to handle all the birds at that level. Now, you may think this sounds like a great job. You go in and you get to handle hawks and owls. However, there's a lot more to it than that. Every day all the birds' enclosures have to be hosed out, the birds' food has to be prepared and weighed, and all the birds need to get some sort of enrichment.
Enrichment is kind of like extra-curricular activity.
It's to keep their lives interesting, because they can't all be trained every day, and some of them can't fly, and therefore don't get much exercise. The enrichment is usually some sort of toy or change in their environment. Just something to make their lives more interesting. During the summer there is a BOP show held three times every day. Most of the birds get to be in the show, and most of those get to fly in the show.