Abstract
Great Spotted Woodpeckers were captured in winter in the Tomakomai Experiment Forest of Hokkaido University and their iris color was examined.Except for one case (irides grey), all individuals had either brown or wine red irides. Individuals with brown irides predominated (94.6% of males, 96.0% of females) when they were captured for the first time, but when recaptured one year later they had wine red irides. Thus iris color appears to change from brown to wine red with age; no change of iris color occurred amongest birds with wine red iris when first caught.A model of process of iris color change is given and it is suggested that iris color could be used for ageing woodpeckers (Table 3).
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