Abstract
FIELD workroom observations in this Sanctuary show that intensity of daylight controls reaction of chromatophore cells in irises of the male duck Netta erythropthalma (Wied.). A minor field characteristic of the male African pochard is the brilliant vermilion iris—a feature easily discernible with binoculars at up to about a hundred yards. The female's irises are umber.
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MIDDLEMISS, E. Reaction to Light of Iris-Chromatophores. Nature 176, 353 (1955). https://doi.org/10.1038/176353a0
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DOI: https://doi.org/10.1038/176353a0
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