Abstract
The prevailing view that the prevalence of red colors in the hummingbird flowers of the California and western American flora is related to a preference for red, by hummingbirds is not substantiated by experimental evidence. The present paper advances an alternative hypothesis relating common red coloration to the nomadic and migratory habits of the hummingbirds in this region. It is reasoned that quick recognition of hummingbird flowers by hummingbirds which frequently enter new feeding territories is selectively advantageous for both the plants and their bird pollinators. The display of the same red floral color by the different plant species in the whole area of migration facilitates this quick recognition.
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