Abstract
The thickness of the layers of retina has been measured in six avian species; i. e. Japanese jungle nightjar, feathered-toed scops owl, Japanese jay, whooper swan, Bering island guillemot, and donestic gallus. The former two are nocturnal and the latter four are diurnal.The layer of rods and cones and the inner plexiform layer are thicker in the nocturnals than in the diurnals. The outer nuclear layer, the outer plexiform layer, and the layer of ganglion cells show no significant difference in thickness among these species. In all birds examined, the inner nuclear layer is constantly thicker than the outer nuclear layer. The layer of optic nerve fibers is thicker in the diurnals than in the nocturnals.
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