I feed rats. Simple, cheap, and convenient. When I got one of my snakes it was feeding on mice. Offered a rat the first time, and she didn't take it. I offered it again next week, and she ate it right up. No problems since. (NOT the same rat )

Mooses (Mooice? LOL) are not predators, but they get very aggressive during mating season. They probably called them predators to dumb it down for the 5 year olds and idiots that watch the channel. For the ball, they probably used it because it was available. Plus, the people who made the show didn't want to be eaten by the big, bad BOA...