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Why are vocalizations especially important in the courtship of pied-billed grebes and dabchicks?
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Grebe
Slavonian, or horned, grebe (Podiceps auritus)
In the courtship of pied-billed grebes and dabchicks, vocalizations are especially important because these species are more secretive than other grebes. Consequently, they rely more heavily on sound than on the elaborate visual displays used by their less reclusive relatives.1