illumination, especially when this light is equivalent to full moonlight. However, it is difficult to see how such an event would have long lasting effects on the ecology of any species. Celestial navigation, as in the case of nocturnally migrating birds, may well be sensitive to low levels of illumination equivalent to some of the intermediate cases of reflectance that are predicted. The possibility must be considered that the addition of a point source of reflected light that is equivalent to a bright new star in the night sky could lead to navigational errors. However, available experimental evidence suggest that birds utilizing this form of navigation probably depend more on star "patterns" rather than on single star for orientation. Hence, it seems unlikely that the presence of a new source of illumination, even though it might be equivalent to a star, would have a major impact on migratory behavior.
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