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During the spring, western grebes perform spectacular courtship dances. In the “rushing” display, the mating pair swim side-by-side with their wings held back, their long necks arched, and their yellow beaks angled upward. They swim so quickly that their bodies are pushed up out of the water and they appear to run across the surface. This courtship ritual functions as a reproductive isolating mechanism, one way of preventing western grebes from exchanging genetic material with birds of other species.
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