Fig. 3. Flexible response of the small intestinal mucosa to feeding measured from ultrasonographs. For comparison, multiple measurements of each individual were averaged by individual and day. Values are means ± S.D. from the four snakes in each group. Dotted lines indicate feeding events. (A) Fasting snakes, open symbols; (B) snakes fed every other day, black symbols; grey symbols are for animals that were shedding their skin and did not feed; (C) snakes fed once a week, grey symbols.