It is hoped the resulting information will serve as a basis of comparison in future studies of behavior of vireos; such ethological data are becoming increasingly important, especially as an aid in systematics. [Please select]
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There has been an increasing awareness of the importance of ethological data and of their usefulness in systematics. [Please select]
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After geographical separation took place the initial genetic divergence between the two populations was maintained by means of ecological and ethological isolating mechanisms. [Please select]
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