Vilgerðarson utilised as a means to confirm assumptions that land was closeby while he was at sea.

crows

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eagles

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ducks

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ravens

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Solution

The correct option is D ravens
Vilgerðarson carried aboard his ship a cage of black, crow-like birds called ravens. He released a bird each time he thought land was nearby. If the bird returned, he would assume that there was no land in the vicinity. If the bird disappeared, he would assume the opposite and head in the general direction in which the bird had flown.

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