1. Afik D, Caviedes-Vidal E, Martínez del Rio C, Karasov WH (1995) Dietary modulation of intestinal hydrolytic enzymes in yellow-rumped warblers. Am J Physiol 269:R413–R420
2. Baeza E, Arnould C, Jlali M, Chartrin P, Gigaud V, Mercerand F, Durand C, Meteau K, Le Bihan-Duval E, Berri C (2012) Influence of increasing slaughter age of chickens on meat quality, welfare, and technical and economic results. J Anim Sci 90:2003–2013
3. Biviano AB, Martínez del Rio C, Phillips DL (1993) Ontogenesis of intestine morphology and intestinal disaccharidases in chickens (Gallus gallus) fed contrasting purified diets. J Comp Physiol B 163:508–518
4. Brzęk P, Caviedes-Vidal E, Karasov WH (2010a) House sparrow fledglings leave the nest digestively immature but more flexible than adults. Integr Comp Biol 50:E19–E19
5. Brzęk P, Lessner KM, Caviedes-Vidal E, Karasov WH (2010b) Low plasticity in digestive physiology constrains feeding ecology in diet specialist, zebra finch (Taeniopygia guttata). J Exp Biol 213:798–807