Which grebe species show courtship feeding?

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Slavonian, or horned, grebe (Podiceps auritus) — Grebe Slavonian, or horned, grebe (*Podiceps auritus*)

Courtship feeding in grebes, a behavior where one bird feeds another, is known to occur only in the western grebe (Aechmophorus occidentalis) and the closely related Clark’s grebe (A. clarkii). In both of these species, the male performs the feeding of the female.1