What foods do eared grebes eat?

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

The eared grebe (Podiceps nigricollis) feeds primarily on small invertebrates. Like other members of the grebe family, their diet consists almost entirely of animal matter.1

Additionally, eared grebes are known to swallow their own feathers, which form a plug in the stomach to help filter material before it passes into the intestine.1