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The article presents the results of the study on Zenaida Doves in Barbados to establish resource polymorphism or existence of alternative phenotypes in relation to resource use as a result of disruptive selection. It confirms that territorial adult doves were larger than flock-feeding ones and the reverse condition occurs among their juveniles. The article concludes that caution should be exerted when referring to well-defined ecological concepts such as resource polymorphism to interpret intrapopulation variation in foraging strategy.