Often they will eat more at first on a raw diet, especially if it's winter season, my two eat 5-6 ozs together but they are old. Younger ones will eat more, males eat more than females. Depends on what they like to, in a day mine would eat 4 young mice, a medium guinea pig or half a large quail. If I give them chicken or something they think is boring they might only eat 1-2 oz. I just check on them 3-4 times a day, if they have food fine, if they need more I give more. You can feed stuff frozen too on hot days.