Heaton, M B Developing visual function in the pigeon embryo with comparative reference to other avian species. [electronic resource] - Journal of comparative and physiological psychology Jan 1974 - 151-6 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0021-9940 Standard No.: 10.1037/h0035921 doi Subjects--Topical Terms: AnimalsAnimals, Newborn--physiologyChick Embryo--physiologyColumbidae--embryologyDucks--physiologyEmbryo, Nonmammalian--physiologyIncubatorsNictitating Membrane--physiologyPhotic StimulationQuail--physiologyReflex, PupillarySpecies SpecificityVision, Ocular