Diet
The Labrador Duck fed on small molluscs, and some fishermen reported catching it on fishing lines baited with mussels. The structure of the bill was highly modified from that of most ducks, having a wide, flattened tip with numerous lamellae inside. In this way it is considered an ecological counterpart of the North Pacific/North Asian Steller's Eider. The beak was also particularly soft, and may have been used to probe through sediment for food.
Another, completely unrelated, duck with similar (but even more specialized) bill morphology is the Australian Pink-eared Duck, which feeds largely on plankton, but also mollusks; the condition in the Labrador Duck probably resembled that in the Blue Duck most in outward appearance.
Read more about this topic: Labrador Duck
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