i have 6 snakes all around the same age and their weight vary greatly. for comparison. i have two females that were born in june of 09 and one it 600 gmas. the other is around the 1300 mark. the smaller female is a picky eater, only goes for mice. the other will eat anyhing that you put in front of her. but i still only offer once a week to her like the rest. i guess she just puts every gram of food to work.