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Caviedes-Vidal, Enrique, Todd J. McWhorter, Shana R. Lavin, Juan G. Chediack, Christopher R. Tracy, and William H. Karasov. The Digestive Adaptation of Flying Vertebrates: High Intestinal Paracellular Absorption Compensates for Smaller Guts. National Academy of Sciences, 2007.

Caviedes-Vidal, Enrique, et al. The Digestive Adaptation of Flying Vertebrates: High Intestinal Paracellular Absorption Compensates for Smaller Guts. National Academy of Sciences, 2007.