Are you talking about mice? If so, I could see them eating hoppers first thing. I believe with rats pinkies are common as first food items.
As for the next thing you need to know, I have had the ball for a month, and it has never taken a meal with us. If he were well started I wouldn't be concerned about that, but this guy is a baby. 80 grams or so.
Thanks, but I have watched all of those videos. I am wondering specifically why it looks so easy to pry their mouths open on the videos, but my guy was so stubborn!