Well they are being instructed to use tools for feeding and most animals have more common sense than the majority of modern humans so they've probably developed a sense of not being overly aggressive in taking the food.Page 3 jesus do they really have those in Japan? There's gotta be idiots and children losing fingers every other week.
There's also two layers of bars separated enough that it'd be difficult, if not impossible, to get fingers out there to be eaten.Well they are being instructed to use tools for feeding and most animals have more common sense than the majority of modern humans so they've probably developed a sense of not being overly aggressive in taking the food.